<button class="play-pause-button">
    <i>P</i>
    <i>l</i>
    <i>a</i>
    <i>y</i>
    <i>use</i>
</button>

<!-- dribbble - twitter -->
<a class="dribbble" href="https://dribbble.com/shots/8826937-Play-Pause-Button" 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>

.play-pause-button {
    --play: #6D58FF;
    --play-shadow: #{rgba(#6D58FF, .24)};
    --pause: #2B3044;
    --pause-shadow: #{rgba(#2B3044, .24)};
    --color: #fff;
    --icon: var(--color);
    margin: 0;
    line-height: 20px;
    font-size: 14px;
    padding: 11px 12px 11px 36px;
    border-radius: 22px;
    border: none;
    background: none;
    outline: none;
    cursor: pointer;
    display: flex;
    position: relative;
    backface-visibility: hidden;
    -webkit-appearance: none;
    -webkit-tap-highlight-color: transparent;
    transform: translateY(var(--y, 0)) translateZ(0);
    color: var(--color);
    box-shadow: 0 var(--shadow-y, 6px) var(--shadow-b, 16px) var(--shadow, var(--pause-shadow));
    background: radial-gradient(circle, var(--play) 0%, var(--play) 50%, var(--pause) 50.5%, var(--pause) 100%);
    background-size: 400% 400%;
    background-position: 0% 0%;
    transition: background .8s, box-shadow .3s, transform .3s;
    &:hover {
        --y: -1px;
        --shadow-y: 8px;
        --shadow-b: 20px;
    }
    &:active {
        --y: 1px;
        --shadow-y: 4px;
        --shadow-b: 12px;
    }
    &:before,
    &:after {
        content: '';
        background: var(--icon);
        width: var(--width, 16px);
        height: 12px;
        position: absolute;
        left: 18px;
        top: 15px;
        backface-visibility: hidden;
        transform-origin: 50% 100%;
        transform: translateX(var(--x, 0)) translateZ(0);
        -webkit-clip-path: polygon(0 0, 3px 0, 3px 12px, 0 12px);
        clip-path: polygon(0 0, 3px 0, 3px 12px, 0 12px);
        transition: clip-path .6s ease;
    }
    &:after {
        --width: 3px;
        --x: 6px;
    }
    i {
        display: block;
        font-weight: bold;
        font-style: normal;
        backface-visibility: hidden;
        opacity: var(--o, 1);
        transform: translateX(var(--x, 0));
        transition: transform .6s, opacity .6s;
        &:nth-child(2) {
            --o: 0;
            --x: 0;
        }
        &:nth-child(3) {
            --x: -50%;
        }
        &:nth-child(4) {
            --o: 0;
        }
        &:last-child {
            --x: -50%;
        }
    }
    &.paused {
        --shadow: var(--play-shadow);
        animation: var(--name, background-paused) .8s ease forwards;
        i {
            &:first-child {
                --x: 40%;
            }
            &:nth-child(2) {
                --o: 1;
                --x: 100%;
            }
            &:nth-child(3) {
                --x: 50%;
            }
            &:nth-child(4) {
                --o: 1;
                --x: 50%;
            }
            &:last-child {
                --x: 0;
                --o: 0;
            }
        }
        &:before {
            -webkit-clip-path: polygon(0 0, 11px 6px, 11px 6px, 0 12px);
            clip-path: polygon(0 0, 11px 6px, 11px 6px, 0 12px);
            transition-delay: .9s;
        }
        &:after {
            animation: to-play .9s ease forwards;
        }
        &.playing {
            --shadow: var(--pause-shadow);
            --name: background-playing;
            &:before {
                -webkit-clip-path: polygon(0 0, 3px 0, 3px 12px, 0 12px);
                clip-path: polygon(0 0, 3px 0, 3px 12px, 0 12px);
                transition-delay: 0s;
            }
            &:after {
                animation: to-pause 1.3s ease forwards;
            }
            i {
                &:first-child {
                    --x: 0;
                }
                &:nth-child(2) {
                    --o: 0;
                    --x: 0;
                }
                &:nth-child(3) {
                    --x: -50%;
                    --o: 1;
                }
                &:nth-child(4) {
                    --o: 0;
                    --x: 0;
                }
                &:last-child {
                    --x: -50%;
                    --o: 1;
                }
            }
        }
    }
}

@keyframes to-play {
    15% {
        transform: translateX(6px) scaleY(1.1);
    }
    30% {
        transform: translateX(6px) scaleY(.9);
    }
    45% {
        transform: translateX(6px) scaleY(1.15);
        -webkit-clip-path: polygon(0 0, 3px 0, 3px 12px, 0 12px);
        clip-path: polygon(0 0, 3px 0, 3px 12px, 0 12px);
        transform-origin: 50% 100%;
    }
    60%,
    100% {
        -webkit-clip-path: polygon(0 9px, 3px 9px, 3px 12px, 0 12px);
        clip-path: polygon(0 9px, 3px 9px, 3px 12px, 0 12px);
        transform-origin: 50% 10.5px;
    }
    60% {
        transform: translateX(6px);
    }
    99% {
        transform: translateX(0) rotate(-270deg);
    }
    100% {
        transform: translateX(0) rotate(-270deg) scale(0);
    }
}

@keyframes to-pause {
    0%,
    50% {
        -webkit-clip-path: polygon(0 9px, 3px 9px, 3px 12px, 0 12px);
        clip-path: polygon(0 9px, 3px 9px, 3px 12px, 0 12px);
        transform-origin: 50% 10.5px;
    }
    0%,
    39% {
        transform: translateX(0) rotate(-270deg) scale(0);
    }
    40% {
        transform: translateX(0) rotate(-270deg);
    }
    50% {
        transform: translateX(6px) rotate(0deg);
    }
    60%,
    100% {
        transform: translateX(6px);
        -webkit-clip-path: polygon(0 0, 3px 0, 3px 12px, 0 12px);
        clip-path: polygon(0 0, 3px 0, 3px 12px, 0 12px);
        transform-origin: 50% 100%;
    }
    70% {
        transform: translateX(6px) scaleY(1.15);
    }
    80% {
        transform: translateX(6px) scaleY(.9);
    }
    90% {
        transform: translateX(6px) scaleY(1.05);
    }
    100% {
        transform: translateX(6px);
    }
}

@keyframes background-paused {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 50% 50%;
    }
}

@keyframes background-playing {
    from {
        background-position: 50% 50%;
    }
    to {
        background-position: 100% 100%;
    }
}

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;
    background: #ECEFFC;
    .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;
        }
    }
}

document.querySelectorAll('.play-pause-button').forEach(button => {
    button.addEventListener('click', e => {
        if(button.classList.contains('playing')) {
            button.classList.remove('paused', 'playing');
            button.classList.add('paused');
        } else {
            if(button.classList.contains('paused')) {
                button.classList.add('playing');
            }
        }
        if(!button.classList.contains('paused')) {
            button.classList.add('paused');
        }
    });
});