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HTML 

              
                <div class="container" id="app">

    <div class="col">

        <div class="box">
            <h3>Colors <small><span>Pro Tip</span>Edit Hex codes</small></h3>
            <div>

                <div class="demo-color">
                    <div class="preview">
                        <span style="--background: var(--primary-1)"></span>
                        <div class="edit">
                            <strong>--primary-1</strong>
                            <div class="input">
                                <input class="form-field" v-model="colors['--primary-1']" maxlength="7" type="text">
                            </div>
                        </div>
                    </div>
                    <div v-bind:class="{ examples: true, open: examplesToggle.first }" @click="examplesToggle.first = !examplesToggle.first">
                        <span><i></i><i></i></span>
                        <div>
                            <ul>
                                <li v-for="color in codepenChallange" :style="'--color: ' + color" @click="setColor(color, '--primary-1')"></li>
                            </ul>
                            <ul>
                                <li v-for="color in examples" :style="'--color: ' + color" @click="setColor(color, '--primary-1')"></li>
                            </ul>
                        </div>
                    </div>
                </div>

                <div class="demo-color">
                    <div class="preview">
                        <span style="--background: var(--primary-2)"></span>
                        <div class="edit">
                            <strong>--primary-2</strong>
                            <div class="input">
                                <input class="form-field" v-model="colors['--primary-2']" maxlength="7" type="text">
                            </div>
                        </div>
                    </div>
                    <div v-bind:class="{ examples: true, open: examplesToggle.second }" @click="examplesToggle.second = !examplesToggle.second">
                        <span><i></i><i></i></span>
                        <div>
                            <ul>
                                <li v-for="color in codepenChallange" :style="'--color: ' + color" @click="setColor(color, '--primary-2')"></li>
                            </ul>
                            <ul>
                                <li v-for="color in examples" :style="'--color: ' + color" @click="setColor(color, '--primary-2')"></li>
                            </ul>
                        </div>
                    </div>
                </div>

                <div class="demo-color">
                    <div class="preview">
                        <span style="--background: var(--primary-3)"></span>
                        <div class="edit">
                            <strong>--primary-3</strong>
                            <div class="input">
                                <input class="form-field" v-model="colors['--primary-3']" maxlength="7" type="text">
                            </div>
                        </div>
                    </div>
                    <div v-bind:class="{ examples: true, open: examplesToggle.third }" @click="examplesToggle.third = !examplesToggle.third">
                        <span><i></i><i></i></span>
                        <div>
                            <ul>
                                <li v-for="color in codepenChallange" :style="'--color: ' + color" @click="setColor(color, '--primary-3')"></li>
                            </ul>
                            <ul>
                                <li v-for="color in examples" :style="'--color: ' + color" @click="setColor(color, '--primary-3')"></li>
                            </ul>
                        </div>
                    </div>
                </div>

            </div>
        </div>

        <div class="box">
            <div>

                <div class="demo-color">
                    <div class="preview">
                        <span style="--background: var(--border)"></span>
                        <div class="edit">
                            <strong>--border</strong>
                            <div class="input">
                                <input class="form-field" v-model="colors['--border']" maxlength="7" type="text">
                            </div>
                        </div>
                    </div>
                </div>

                <div class="demo-color">
                    <div class="preview">
                        <span style="--background: var(--border-hover)"></span>
                        <div class="edit">
                            <strong>--border-hover</strong>
                            <div class="input">
                                <input class="form-field" v-model="colors['--border-hover']" maxlength="7" type="text">
                            </div>
                        </div>
                    </div>
                </div>

                <div class="demo-color">
                    <div class="preview">
                        <span style="--background: var(--text-color)"></span>
                        <div class="edit">
                            <strong>--text-color</strong>
                            <div class="input">
                                <input class="form-field" v-model="colors['--text-color']" maxlength="7" type="text">
                            </div>
                        </div>
                    </div>
                </div>

                <div class="demo-color">
                    <div class="preview">
                        <span style="--background: var(--text-color-headline)"></span>
                        <div class="edit">
                            <strong>--text-color-headline</strong>
                            <div class="input">
                                <input class="form-field" v-model="colors['--text-color-headline']" maxlength="7" type="text">
                            </div>
                        </div>
                    </div>
                </div>

            </div>
        </div>

    </div>

    <div class="col">

        <div class="box">
            <h3>Checkbox &amp; Radio</h3>
            <div>
                <div class="demo-toggle">

                    <label class="checkbox">
                        <input type="checkbox" checked>
                        <span>Checkbox</span>
                    </label>
                    <label class="checkbox">
                        <input type="checkbox">
                        <span>Checkbox</span>
                    </label>

                </div>
                <div class="demo-toggle">

                    <label class="radio">
                        <input type="radio" name="r" value="1" checked>
                        <span>Radio</span>
                    </label>
                    <label class="radio">
                        <input type="radio" name="r" value="2">
                        <span>Radio</span>
                    </label>

                </div>
                <div class="demo-toggle">

                    <label class="switch">
                        <input type="checkbox" checked>
                        <span>Switch</span>
                    </label>
                    <label class="switch">
                        <input type="checkbox">
                        <span>Switch</span>
                    </label>

                </div>

                <div class="radioGroup" style="--color: var(--primary-2)">
                    <label>
                        <input type="radio" name="r2" value="1" checked>
                        <span>Radio</span>
                    </label>
                    <label>
                        <input type="radio" name="r2" value="2">
                        <span>Radio</span>
                    </label>
                    <label>
                        <input type="radio" name="r2" value="3">
                        <span>Radio</span>
                    </label>
                </div>

            </div>
        </div>

        <div class="box">
            <h3>Buttons</h3>
            <div>
                <div class="demo-button">

                    <a href="" class="btn" style="--color: var(--primary-2)">Dribbble</a>
                    <a href="" class="btn"><i data-eva="twitter"></i>Twitter</a>
                    <a href="" class="btn icon"  style="--color: var(--primary-3)"><i data-eva="arrow-circle-down-outline"></i></a>

                </div>
                <div class="demo-button">

                    <a href="" class="btn sm" style="--color: var(--primary-2)">Small Button</a>
                    <a href="" class="btn sm"><i data-eva="at-outline"></i>Mail</a>
                    <a href="" class="btn sm icon"  style="--color: var(--primary-3)"><i data-eva="bell-outline"></i></a>

                </div>
                <div class="demo-button">

                    <a href="" class="btn border" style="--color: var(--primary-2)">Outline</a>
                    <a href="" class="btn border"><i data-eva="color-palette-outline"></i>Colors</a>
                    <a href="" class="btn border icon"  style="--color: var(--primary-3)"><i data-eva="cube-outline"></i></a>

                </div>
                <div class="demo-button">

                    <a href="" class="btn sm border" style="--color: var(--primary-2)">Small Outline</a>
                    <a href="" class="btn sm border"><i data-eva="message-square-outline"></i>Chat</a>
                    <a href="" class="btn sm border icon"  style="--color: var(--primary-3)"><i data-eva="phone-call-outline"></i></a>

                </div>
            </div>
        </div>

    </div>

    <div class="col">

        <div class="box">
            <h3>Icon list</h3>
            <div>

                <ul class="iconList">
                    <li>
                        <a href="">
                            <div class="icon">
                                <i data-eva="clipboard-outline"></i>
                            </div>
                            <div class="text">
                                First list entry
                                <small>Lorem ipsum dolor sit amet</small>
                            </div>
                            <i data-eva="chevron-right-outline"></i>
                        </a>
                    </li>
                    <li style="--color: var(--primary-2)">
                        <a href="">
                            <div class="icon">
                                <i data-eva="heart-outline"></i>
                            </div>
                            <div class="text">
                                Another entry
                                <small>Lorem ipsum dolor sit amet</small>
                            </div>
                            <i data-eva="chevron-right-outline"></i>
                        </a>
                    </li>
                    <li style="--color: var(--primary-3)">
                        <a href="">
                            <div class="icon">
                                <i data-eva="flash-outline"></i>
                            </div>
                            <div class="text">
                                Last but not least
                                <small>Lorem ipsum dolor sit amet</small>
                            </div>
                            <i data-eva="chevron-right-outline"></i>
                        </a>
                    </li>
                </ul>

            </div>

        </div>

        <form class="box">
            <h3>Form</h3>
            <div>

                <div class="form-element">
                    <label>Email</label>
                    <input class="form-field" type="text" placeholder="hello@hello.com">
                </div>

                <button class="btn">
                    <i data-eva="email-outline"></i>Sign up
                </button>

            </div>
        </div>

    </div>

</div>

<!-- dribbble -->
<a class="dribbble" href="https://dribbble.com/shots/5848889-Free-UI-Kit-for-CodePenChallenge" target="_blank"><img src="https://cdn.dribbble.com/assets/dribbble-ball-1col-dnld-e29e0436f93d2f9c430fde5f3da66f94493fdca66351408ab0f96e2ec518ab17.png" alt=""></a>
!

CSS 

              
                :root {

    --primary-1: #F44336;
    --primary-2: #1E88E5;
    --primary-3: #FDD835;

    --border: #CDD9ED;
    --border-hover: #99A3BA;
    --text-color: #6C7486;
    --text-color-headline: #3F4656;

    --shadow: rgba(22, 30, 50, .04);

}

body {
    font-family: 'Encode Sans';
    font-size: 16px;
    line-height: 22px;
    color: var(--text-color);
    background: #F5F9FF;
}

// Inputs

.form-field {
    --color: var(--primary-1);
    outline: none;
    display: block;
    width: 100%;
    -webkit-appearance: none;
    background: #fff;
    border: 1px solid var(--border);
    padding: 8px 16px;
    line-height: 22px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-color);
    border-radius: 6px;
    transition: border .3s ease;
    &::placeholder {
        color: var(--border-hover);
    }
    &:focus {
        outline: none;
        border-color: var(--color);
    }
}

.form-element {
    margin-bottom: 20px;
    label {
        display: block;
        margin-bottom: 4px;
        font-size: 14px;
        color: var(--text-color-headline);
        font-weight: 500;
    }
}

// Iconlist

.iconList {
    margin: 0;
    padding: 0;
    list-style: none;
    li {
        --color: var(--primary-1);
        margin: 0 0 20px 0;
        border: 1px solid var(--border);
        border-radius: 6px;
        padding: 12px;
        &:last-child {
            margin-bottom: 0;
        }
        a {
            display: flex;
            align-items: center;
            position: relative;
            text-decoration: none;
            .icon {
                width: 44px;
                height: 44px;
                position: relative;
                margin-right: 12px;
                &:before {
                    content: '';
                    top: 0;
                    left: 0;
                    right: 0;
                    bottom: 0;
                    position: absolute;
                    border-radius: 50%;
                    display: block;
                    background: var(--color);
                    opacity: .1;
                }
                svg {
                    display: block;
                    position: absolute;
                    left: 50%;
                    top: 50%;
                    width: 20px;
                    height: 20px;
                    fill: var(--color);
                    transform: translate(-50%, -50%);
                }
            }
            .text {
                color: var(--text-color-headline);
                font-weight: 600;
                font-size: 14px;
                small {
                    display: block;
                    font-size: 12px;
                    font-weight: 500;
                    opacity: .75;
                    color: var(--text-color);
                }
            }
            & > svg {
                position: absolute;
                display: block;
                right: 0;
                top: 50%;
                transform: translateY(-50%);
                transition: transform .3s ease;
                fill: var(--border-hover);
            }
            &:hover {
                & > svg {
                    transform: translateY(-50%) translateX(2px);
                }
            }
        }
    }
}

// Toggles

.radioGroup {
    --color: var(--primary-1);
    --border-width: 2px;
    display: flex;
    font-size: 14px;
    font-weight: 600;
    label {
        cursor: pointer;
        input {
            display: none;
            & + span {
                display: block;
                position: relative;
                padding: 7px 20px;
                border: var(--border-width) solid var(--border);
                transition: background .3s ease, border-color .3s ease;
            }
            &:checked {
                & + span {
                    z-index: 2;
                    background: var(--color);
                    border-color: var(--color);
                    color: #fff;
                }
            }
        }
        &:hover {
            input {
                & + span {
                    z-index: 1;
                    border-color: var(--color);
                }
            }
        }
        &:first-child {
            input {
                & + span {
                    border-radius: 6px 0 0 6px;
                }
            }
        }
        &:last-child {
            input {
                & + span {
                    border-radius: 0 6px 6px 0;
                }
            }
        }
        &:not(:first-child) {
            margin-left: calc(var(--border-width) * -1);
        }
    }
}

.checkbox,
.radio,
.switch {
    --color: var(--primary-1);
    --border-hover: var(--primary-1);
    --border-width: 2px;
    margin: 0 0 12px 0;
    display: table;
    cursor: pointer;
    &.inline {
        margin: 0 12px 0 0;
        display: inline-block;
    }
    input {
        display: none;
        & + span {
            color: var(--text-color);
            height: 22px;
            font-size: 14px;
            font-weight: 500;
            position: relative;
            display: block;
            &:before,
            &:after {
                content: '';
                display: block;
                left: 0;
                top: 0;
                position: absolute;
            }
            &:before {
                height: 22px;
                border: var(--border-width) solid var(--border);
                background: #fff;
                transition: background .3s ease, border-color .3s ease;
            }
            &:after {
                transition: transform .3s ease, opacity .2s ease,  background .2s ease;
            }
        }
        &:checked + span {
            &:before {
                background: var(--color);
                border-color: var(--color);
            }
            &:after {
                transition: opacity .3s ease, background .3s ease, transform .6s cubic-bezier(.175, .88, .32, 1.2);
            }
        }
    }
    &:hover {
        input {
            &:not(:checked) + span {
                &:before {
                    border-color: var(--border-hover);
                }
            }
        }
    }
}

.checkbox,
.radio {
    input {
        & + span {
            padding-left: 22px;
            &:not(:empty) {
                padding-left: 30px;
            }
            &:before {
                width: 22px;
            }
            &:after {
                opacity: 0;
            }
        }
        &:checked + span {
            &:after {
                opacity: 1;
            }
        }
    }
}

.checkbox {
    input {
        & + span {
            &:before {
                border-radius: 6px;
            }
            &:after {
                width: 5px;
                height: 9px;
                border: 2px solid #fff;
                border-top: 0;
                border-left: 0;
                left: 8px;
                top: 5px;
                transform: rotate(20deg);
            }
        }
        &:checked + span {
            &:after {
                transform: rotate(43deg)translate(1px, 0);
            }
        }
    }
}

.radio {
    input {
        & + span {
            &:before,
            &:after {
                border-radius: 50%;
            }
            &:after {
                width: 22px;
                height: 22px;
                background: #fff;
                opacity: 0;
                transform: scale(.6);
            }
        }
        &:checked + span {
            &:after {
                background: #fff;
                transform: scale(.4);
            }
        }
    }
}

.switch {
    input {
        & + span {
            padding-left: 38px;
            &:not(:empty) {
                padding-left: 46px;
            }
            &:before {
                width: 38px;
                border-radius: 11px;
            }
            &:after {
                left: 4px;
                top: 4px;
                border-radius: 50%;
                width: 14px;
                height: 14px;
                background: var(--border);
            }
        }
        &:checked + span {
            &:after {
                background: #fff;
                transform: translateX(16px) scale(.9);
            }
        }
    }
    &:hover {
        input {
            &:not(:checked) + span {
                &:after {
                    background: var(--border-hover);
                }
            }
        }
    }
}

// Buttons

.btn {
    --color: var(--primary-1);
    --text: #fff;
    display: inline-block;
    text-align: center;
    vertical-align: middle;
    touch-action: manipulation;
    position: relative;
    white-space: nowrap;
    border: none;
    color: var(--text);
    padding: 9px 24px;
    font-size: 14px;
    line-height: 22px;
    font-weight: 600;
    background: var(--color);
    border-radius: 6px;
    text-decoration: none;
    transition: all .3s ease;
    &:link,
    &:active,
    &:visited,
    &:focus {
        color: var(--text);
    }
    svg {
        position: relative;
        left: -4px;
        width: 18px;
        height: 18px;
        display: inline-block;
        vertical-align: top;
        font-weight: normal;
        margin: 2px 0;
        fill: var(--text);
        &.right {
            left: auto;
            right: -4px;
        }
    }
    &.icon {
        padding: 9px;
        svg {
            left: auto;
            right: auto;
            display: block;
            margin: 2px;
        }
    }
    &.sm {
        font-size: 14px;
        border-radius: 6px;
        padding: 6px 16px;
        &.icon {
            padding: 6px;
            svg {
                margin: 3px;
            }
        }
        svg {
            width: 16px;
            height: 16px;
            margin: 3px 0;
        }
    }
    &.border {
        --text: var(--color);
        background: none;
        &:before {
            content: '';
            left: 0;
            right: 0;
            top: 0;
            bottom: 0;
            position: absolute;
            z-index: 0;
            border-radius: inherit;
            transition: border-color .3s ease;
            border: 1px solid var(--color);
        }
    }
}

// Typography

h3 {
    font-family: 'Encode Sans';
    font-weight: 700;
    font-size: 18px;
    color: var(--text-color-headline);
    margin: 0 0 16px 0;
}

// Styles for demo

.container {
    padding: 24px 0;
    margin: 0 auto;
    @media(min-width: 720px) {
        padding: 32px 0;
        max-width: 720px;
        display: grid;
        grid-gap: 20px;
        grid-auto-rows: min-content;
        grid-template-columns: repeat(2, 1fr);
    }
    @media(min-width: 1140px) {
        padding: 48px 0;
        max-width: 1100px;
        display: grid;
        grid-gap: 40px;
        grid-auto-rows: min-content;
        grid-template-columns: repeat(3, 1fr);
    }
    .col {
        @media(min-width: 720px) {
            display: flex;
            align-content: space-between;
            flex-wrap: wrap;
            .box {
                flex: 0 0 100%;
            }
        }
    }
    h3 {
        display: flex;
        justify-content: space-between;
        align-items: center;
        height: 22px;
        small {
            color: var(--border-hover);
            font-size: 12px;
            font-weight: 600;
            display: flex;
            align-items: center;
            span {
                display: block;
                background: var(--primary-1);
                color: #fff;
                text-transform: uppercase;
                font-style: normal;
                font-size: 10px;
                font-weight: 700;
                line-height: 18px;
                border-radius: 9px;
                padding: 0 8px;
                margin: 0 4px 0 0;
            }
        }
    }
    .box {
        max-width: 340px;
        margin: 0 auto;
        & > div {
            padding: 24px;
            background: #fff;
            border-radius: 8px;
            box-shadow: 0 2px 4px var(--shadow);
            border: 1px solid var(--border);
            margin: 0 0 40px 0;
            .demo-toggle {
                display: flex;
                flex-wrap: wrap;
                margin: 0 0 20px 0;
                &:last-child {
                    margin-bottom: 0;
                }
                label {
                    flex: 0 0 50%;
                    display: block;
                    margin: 0;
                }
            }
            .demo-button {
                margin-bottom: 20px;
                &:last-child {
                    margin-bottom: 0;
                }
                .btn {
                    margin: 0 8px 0 0;
                    &:last-child {
                        margin-right: 0;
                    }
                }
            }
            .demo-color {
                display: flex;
                align-items: center;
                justify-content: space-between;
                margin: 0 0 20px 0;
                position: relative;
                &:last-child {
                    margin-bottom: 0;
                }
                .preview {
                    display: flex;
                    align-items: center;
                    & > span {
                        --background: #000;
                        display: block;
                        width: 46px;
                        height: 46px;
                        flex-basis: 46px;
                        border-radius: 12px;
                        margin: 0 20px 0 0;
                        background: var(--background);
                    }
                    .edit {
                        strong {
                            font-weight: 600;
                            color: var(--text-color-headline);
                        }
                        .input {
                            display: flex;
                            input {
                                line-height: 22px;
                                padding: 0;
                                display: block;
                                border: 0;
                                background: none;
                            }
                        }
                    }
                }
                .examples {
                    position: relative;
                    span {
                        cursor: pointer;
                        width: 18px;
                        height: 18px;
                        display: block;
                        z-index: 2;
                        position: relative;
                        transition: transform .3s ease, background .2s ease;
                        i {
                            &,
                            &:before {
                                width: 8px;
                                height: 8px;
                                background: var(--border);
                                display: block;
                                position: absolute;
                                border-radius: 2px;
                                transition: border-radius .2s ease, background .2s ease;
                            }
                            &:before {
                                content: '';
                            }
                            &:first-child {
                                left: 0;
                                top: 0;
                                &:before {
                                    top: 0;
                                    left: 10px;
                                }
                            }
                            &:last-child {
                                left: 0;
                                bottom: 0;
                                &:before {
                                    bottom: 0;
                                    left: 10px;
                                }
                            }
                        }
                    }
                    div {
                        opacity: 0;
                        visibility: hidden;
                        position: absolute;
                        transform: scaleY(.8);
                        transform-origin: 50% 0;
                        background: #fff;
                        z-index: 1;
                        border-radius: 8px;
                        box-shadow: 0 2px 4px var(--shadow);
                        border: 1px solid var(--border);
                        padding: 34px 8px 8px 8px;
                        top: -8px;
                        right: -8px;
                        width: 80px;
                        transition: opacity .2s ease, visibility .2s ease, transform .3s cubic-bezier(.4, .6, .5, 1.2);
                        ul {
                            list-style: none;
                            display: grid;
                            grid-gap: 6px;
                            grid-template-columns: repeat(3, 1fr);
                            margin: 0 0 6px 0;
                            padding: 0 0 6px 0;
                            border-bottom: 1px solid var(--border);
                            &:last-child {
                                margin-bottom: 0;
                                padding-bottom: 0;
                                border-bottom: 0;
                            }
                            li {
                                --color: #000;
                                width: 100%;
                                padding-bottom: 100%;
                                border-radius: 4px;
                                cursor: pointer;
                                background: var(--color);
                                transition: transform .3s cubic-bezier(.4, .6, .5, 1.2);
                                &:hover {
                                    transform: scale(.9);
                                }
                            }
                        }
                    }
                    &.open {
                        z-index: 3;
                        span {
                            background: var(--border);
                            transform: rotate(45deg) scale(.8);
                            i {
                                &,
                                &:before {
                                    border-radius: 0;
                                    background: #fff;
                                }
                            }
                        }
                        div {
                            opacity: 1;
                            visibility: visible;
                            transform: scaleY(1);
                        }
                    }
                }
            }
        }
    }
}


html {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

* {
    box-sizing: inherit;
    &:before,
    &:after {
        box-sizing: inherit;
    }
}

// Center & dribbble
body {
    min-height: 100vh;
    .dribbble {
        position: fixed;
        display: block;
        right: 20px;
        bottom: 20px;
        opacity: .5;
        transition: all .4s ease;
        &:hover {
            opacity: 1;
        }
        img {
            display: block;
            height: 36px;
        }
    }
}
!

JS 

              
                new Vue({
    el: '#app',
    data() {
        return {
            colors: {
                '--primary-1': '#F44336',
                '--primary-2': '#1E88E5',
                '--primary-3': '#FDD835',
                '--border': '#CDD9ED',
                '--border-hover': '#99A3BA',
                '--text-color': '#6C7486',
                '--text-color-headline': '#3F4656'
            },
            codepenChallange: ['#F44336', '#1E88E5', '#FDD835'],
            examples: ['#5628EE', '#8C6FF0', '#23C4F8', '#D93757', '#3FDC75', '#F6D87C'],
            examplesToggle: {
                first: false,
                second: false,
                third: false
            }
        }
    },
    methods: {
        cssVar(name, value) {
            document.documentElement.style.setProperty(name, value)
        },
        setColor(color, name) {
            this.colors[name] = color;
        }
    },
    watch: {
        colors: {
            handler(val) {
                for(var key in val) {
                    if(val.hasOwnProperty(key) && /(^#[0-9A-F]{6}$)|(^#[0-9A-F]{3}$)/i.test(val[key])) {
                        this.cssVar(key, val[key])
                    }
                }
            },
            deep: true
        }
    }
})

eva.replace()
!
999px

Console