<input type="checkbox" class="plus-minus">

<!-- dribbble - twitter -->
<a class="dribbble" href="https://dribbble.com/shots/9834681--Toggle" target="_blank"><img src="https://cdn.dribbble.com/assets/dribbble-ball-mark-2bd45f09c2fb58dbbfb44766d5d1d07c5a12972d602ef8b32204d28fa3dda554.svg" alt=""></a>
<a class="twitter" target="_blank" href="https://twitter.com/aaroniker_me"><svg xmlns="http://www.w3.org/2000/svg" width="72" height="72" viewBox="0 0 72 72"><path d="M67.812 16.141a26.246 26.246 0 0 1-7.519 2.06 13.134 13.134 0 0 0 5.756-7.244 26.127 26.127 0 0 1-8.313 3.176A13.075 13.075 0 0 0 48.182 10c-7.229 0-13.092 5.861-13.092 13.093 0 1.026.118 2.021.338 2.981-10.885-.548-20.528-5.757-26.987-13.679a13.048 13.048 0 0 0-1.771 6.581c0 4.542 2.312 8.551 5.824 10.898a13.048 13.048 0 0 1-5.93-1.638c-.002.055-.002.11-.002.162 0 6.345 4.513 11.638 10.504 12.84a13.177 13.177 0 0 1-3.449.457c-.846 0-1.667-.078-2.465-.231 1.667 5.2 6.499 8.986 12.23 9.09a26.276 26.276 0 0 1-16.26 5.606A26.21 26.21 0 0 1 4 55.976a37.036 37.036 0 0 0 20.067 5.882c24.083 0 37.251-19.949 37.251-37.249 0-.566-.014-1.134-.039-1.694a26.597 26.597 0 0 0 6.533-6.774z"></path></svg></a>

.plus-minus {
    --primary: #1E2235;
    --secondary: #FAFBFF;
    --duration: .5s;
    -webkit-appearance: none;
    -moz-appearance: none;
    -webkit-tap-highlight-color: transparent;
    -webkit-mask-image: -webkit-radial-gradient(white, black);
    outline: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transform-style: preserve-3d;
    perspective: 240px;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    border: 4px solid var(--primary);
    background-size: 300% 300%;
    transition: transform .3s;
    transform: scale(var(--scale, 1)) translateZ(0);
    animation: var(--name, unchecked) var(--duration) ease forwards;
    &:before,
    &:after {
        content: '';
        position: absolute;
        width: 16px;
        height: var(--height, 16px);
        left: 6px;
        top: var(--top, 6px);
        background: var(--background, var(--primary));
        animation: var(--name-icon-b, var(--name-icon, unchecked-icon)) var(--duration) ease forwards;
    }
    &:before {
        clip-path: polygon(0 6px, 6px 6px, 6px 0, 10px 0, 10px 6px, 16px 6px, 16px 10px, 10px 10px, 10px 16px, 6px 16px, 6px 10px, 0 10px);
    }
    &:after {
        --height: 4px;
        --top: 12px;
        --background: var(--secondary);
        --name-icon-b: var(--name-icon-a, checked-icon);
    }
    &:active {
        --scale: .95;
    }
    &:checked {
        --name: checked;
        --name-icon-b: checked-icon;
        --name-icon-a: unchecked-icon;
    }
}

@keyframes checked-icon {
    from {
        transform: translateZ(12px);
    }
    to {
        transform: translateX(16px) rotateY(90deg) translateZ(12px);
    }
}

@keyframes unchecked-icon {
    from {
        transform: translateX(-16px) rotateY(-90deg) translateZ(12px);
    }
    to {
        transform: translateZ(12px);
    }
}

@keyframes checked {
    from {
        background-image: radial-gradient(ellipse at center, var(--primary) 0%, var(--primary) 25%, var(--secondary) 25.1%, var(--secondary) 100%);
        background-position: 100% 50%;
    }
    to {
        background-image: radial-gradient(ellipse at center, var(--primary) 0%, var(--primary) 25%, var(--secondary) 25.1%, var(--secondary) 100%);
        background-position: 50% 50%;
    }
}

@keyframes unchecked {
    from {
        background-image: radial-gradient(ellipse at center, var(--secondary) 0%, var(--secondary) 25%, var(--primary) 25.1%, var(--primary) 100%);
        background-position: 100% 50%;
    }
    to {
        background-image: radial-gradient(ellipse at center, var(--secondary) 0%, var(--secondary) 25%, var(--primary) 25.1%, var(--primary) 100%);
        background-position: 50% 50%;
    }
}

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

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

// Center & dribbble
body {
    min-height: 100vh;
    display: flex;
    font-family: 'Roboto', Arial;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background: #FAFBFF;
    .dribbble {
        position: fixed;
        display: block;
        right: 20px;
        bottom: 20px;
        img {
            display: block;
            height: 28px;
        }
    }
    .twitter {
        position: fixed;
        display: block;
        right: 64px;
        bottom: 14px;
        svg {
            width: 32px;
            height: 32px;
            fill: #1da1f2;
        }
    }
}