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HTML

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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About Vendor Prefixing

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <nav class="tabbar">
    <ul>
        <li>
            <em></em>
        </li>
        <li>
            <em></em>
        </li>
        <li>
            <a>
                <div>
                    <div>
                        <label>
                            <input type="radio" name="type" value="play">
                            <span>
                                <svg>
                                    <use xlink:href="#play">
                                </svg>
                            </span>
                            <div></div>
                        </label>
                        <label>
                            <input type="radio" name="type" value="camera" checked>
                            <span>
                                <svg>
                                    <use xlink:href="#camera">
                                </svg>
                            </span>
                            <div></div>
                        </label>
                    </div>
                </div>
            </a>
        </li>
        <li>
            <em></em>
        </li>
        <li>
            <em></em>
        </li>
    </ul>
</nav>
    
<svg xmlns="http://www.w3.org/2000/svg" style="display: none;">
    <symbol xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" id="camera">
        <path d="M6,0 L18,0 C21.3137085,-6.08718376e-16 24,2.6862915 24,6 L24,18 C24,21.3137085 21.3137085,24 18,24 L6,24 C2.6862915,24 4.05812251e-16,21.3137085 0,18 L0,6 C-4.05812251e-16,2.6862915 2.6862915,6.08718376e-16 6,0 Z M12,18 C15.3137085,18 18,15.3137085 18,12 C18,8.6862915 15.3137085,6 12,6 C8.6862915,6 6,8.6862915 6,12 C6,15.3137085 8.6862915,18 12,18 Z M12,15 C13.6568542,15 15,13.6568542 15,12 C15,10.3431458 13.6568542,9 12,9 C10.3431458,9 9,10.3431458 9,12 C9,13.6568542 10.3431458,15 12,15 Z" stroke="none"></path>
    </symbol>
    <symbol xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" id="play">
        <path d="M6,0 L18,0 C21.3137085,-6.08718376e-16 24,2.6862915 24,6 L24,18 C24,21.3137085 21.3137085,24 18,24 L6,24 C2.6862915,24 4.05812251e-16,21.3137085 0,18 L0,6 C-4.05812251e-16,2.6862915 2.6862915,6.08718376e-16 6,0 Z M9,7.2604122 L9,16.7395878 C9,16.9605017 9.1790861,17.1395878 9.4,17.1395878 C9.48091742,17.1395878 9.55993218,17.1150466 9.62661153,17.0692046 L16.2808361,12.4944252 C16.5538996,12.306694 16.6230751,11.9331462 16.435344,11.6600827 C16.3937326,11.5995571 16.3413617,11.5471862 16.2808361,11.5055748 L9.62661153,6.93079543 C9.44456921,6.80564133 9.19553732,6.85175835 9.07038323,7.03380067 C9.02454118,7.10048002 9,7.17949477 9,7.2604122 Z" stroke="none"></path>
    </symbol>
</svg>

<!-- dribbble -->
<a class="dribbble" href="https://dribbble.com/shots/5499032-Tab-bar-video-photo-switch" target="_blank"><img src="https://cdn.dribbble.com/assets/dribbble-ball-mark-2bd45f09c2fb58dbbfb44766d5d1d07c5a12972d602ef8b32204d28fa3dda554.svg" alt=""></a>
!

CSS 

              
                $width: 270px;
$primary: #5628EE;
$primaryLight: #8C6FF0;
$activeIcon: rgba(#fff, .5);
$inactiveIcon: rgba(#C2DBFF, .36);
$inactiveIconHover: rgba(#C2DBFF, .5);

.tabbar {
    border-radius: 6px;
    width: $width;
    ul {
        margin: 0;
        padding: 0;
        list-style: none;
        display: flex;
        position: relative;
        z-index: 1;
        li {
            position: relative;
            flex-grow: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            em {
                width: 32px;
                height: 32px;
                display: block;
                border-radius: 50%;
                background: #1C212E;
            }
            a {
                cursor: pointer;
                display: table;
                position: relative;
                display: flex;
                z-index: 1;
                justify-content: center;
                align-items: center;
                -webkit-tap-highlight-color: rgba(255, 255, 255, 0);
                & > div {
                    width: 44px;
                    height: 44px;
                    position: relative;
                    & > div {
                        position: absolute;
                        width: 44px;
                        height: 88px;
                        overflow: hidden;
                        border-radius: 22px;
                        left: 0;
                        bottom: 0;
                        // Safari fix
                        -webkit-mask-image: -webkit-radial-gradient(white, black);
                        label {
                            cursor: pointer;
                            input {
                                display: none;
                                & + span {
                                    width: 44px;
                                    height: 44px;
                                    display: flex;
                                    justify-content: center;
                                    align-items: center;
                                    position: absolute;
                                    top: 0;
                                    z-index: 1;
                                    &:before {
                                        content: '';
                                        position: absolute;
                                        left: 0;
                                        top: 0;
                                        right: 0;
                                        bottom: 0;
                                        border-radius: 50%;
                                        display: block;
                                        opacity: 0;
                                        transition: opacity .3s ease;
                                        background-image: linear-gradient($primaryLight, $primary);
                                    }
                                    svg {
                                        fill: $inactiveIcon;
                                        width: 16px;
                                        height: 16px;
                                        display: block;
                                        position: relative;
                                        transition: fill .3s ease;
                                    }
                                    &:hover {
                                        svg {
                                            fill: $inactiveIconHover;
                                        }
                                    }
                                    & + div {
                                        left: 0;
                                        top: 50%;
                                        position: absolute;
                                        width: 44px;
                                        height: 88px;
                                        border-radius: 22px;
                                        background-image: linear-gradient($primaryLight, $primary);
                                    }
                                }
                                &:checked {
                                    & + span {
                                        animation: icon .3s linear forwards .3s;
                                        &:before {
                                            opacity: 1;
                                            transition: opacity .3s ease .6s;
                                        }
                                        svg {
                                            fill: $activeIcon;
                                            transition: fill .3s ease .15s;
                                        }
                                        & + div {
                                            background: none;
                                        }
                                    }
                                }
                                &:not(:checked) {
                                    & + span {
                                        transform: translateY(100%);
                                        animation: iconRemove .3s linear forwards .3s;
                                        & + div {
                                            animation: background .6s linear forwards;
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

@keyframes background {
    40%,
    60% {
        transform: translateY(-50%);
    }
}

@keyframes backgroundBefore {
    40%,
    60% {
        transform: translateY(-50%);
    }
}

@keyframes icon {
    100% {
        transform: translateY(100%);
    }
}

@keyframes iconRemove {
    0% {
        transform: translateY(100%);
        opacity: 1;
    }
    40%,
    50% {
        transform: translateY(200%);
        opacity: 1;
    }
    51% {
        opacity: 0;
        z-index: 0;
        transform: translateY(0%);
    }
    52%,
    99% {
        opacity: 1;
        z-index: 0;
        transform: translateY(0%);
    }
    100% {
        opacity: 1;
        z-index: 2;
        transform: translateY(0%);
    }
}

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

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

// Center & dribbble
body {
    min-height: 100vh;
    font-family: Roboto, Arial;
    color: #ADAFB6;
    background: #121621;
    display: flex;
    justify-content: center;
    align-items: center;
    .switch {
        position: absolute;
        bottom: 10%;
        left: 50%;
        user-select: none;
        transform: translate(-50%, 0);
    }
    .dribbble {
        position: fixed;
        display: block;
        right: 20px;
        bottom: 20px;
        img {
            display: block;
            height: 28px;
        }
    }
}
!

JS
!
999px

Console