<button class="heart">
    <div class="heart-flip"></div>
</button>

<button class="heart-button">
    <div class="heart-flip"></div>
    <span>Like<span>d</span></span>
</button>

<!-- dribbble - twitter -->
<a class="dribbble" href="https://dribbble.com/ai" 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>

.heart,
.heart-button {
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    -webkit-tap-highlight-color: transparent;
    .heart-flip {
        --base: 32px;
        --duration: .6s;
        --active: #ea4673;
        --inactive: #d1d6ee;
        width: var(--base);
        height: calc(var(--base) + var(--base) / 2);
        border-radius: calc(var(--base) / 2) calc(var(--base) / 2) 0 0;
        position: relative;
        transform-origin: 50% 66.66%;
        transform-style: preserve-3d;
        transform: rotate(var(--rotate, -45deg));
        transition: background var(--duration), transform var(--duration) ease;
        background: var(--heart-background, var(--inactive));
        &:before,
        &:after {
            content: '';
            width: calc(var(--base) / 2);
            height: var(--base);
            border-radius: var(--pseudo-border-radius, calc(var(--base) / 2) 0 0 calc(var(--base) / 2));
            position: absolute;
            left: var(--pseudo-left, -50%);
            transform-origin: var(--pseudo-origin, 100%) 50%;
            bottom: 0;
            background: var(--heart-background, var(--inactive));
            filter: brightness(var(--pseudo-filter, 50%));
            transform: translateX(1%) rotateY(var(--pseudo-rotate, 90deg)) translateZ(0);
            transition: background var(--duration), transform var(--duration) ease, filter var(--duration);
        }
        &:after {
            --pseudo-border-radius: 0 calc(var(--base) / 2) calc(var(--base) / 2) 0;
            --pseudo-left: 100%;
            --pseudo-origin: 0;
            filter: brightness(var(--pseudo-filter-second, 100%));
            transform: translateX(-1%) rotateY(var(--pseudo-rotate-second, 0deg)) translateZ(0);
        }
    }
    &.active {
        .heart-flip {
            --rotate: 45deg;
            --pseudo-filter: 100%;
            --pseudo-filter-second: 50%;
            --pseudo-rotate: 0deg;
            --pseudo-rotate-second: 90deg;
            --heart-background: var(--active);
        }
    }
}

.heart {
    background: none;
    border: none;
    padding: 0;
    transform: scale(var(--button-scale, 1)) translateZ(0);
    transition: transform .2s;
    &:active {
        --button-scale: .95;
    }
}

.heart-button {
    --duration: .4s;
    --color: #404660;
    --color-hover: #2b3044;
    --color-active: #fff;
    --border: #d1d6ee;
    --border-hover: #bbc1e1;
    --border-active: #ea4673;
    --background: #fff;
    --background-active: #ea4673;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.6;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 7px;
    color: var(--button-color, var(--color));
    border: 1px solid var(--button-border, var(--border));
    background: var(--button-background, var(--background));
    transform: scale(var(--button-scale, 1)) translateZ(0);
    transition: background var(--duration), border-color var(--duration), color var(--duration), transform .2s;
    .heart-flip {
        --base: 8px;
        --active: #fff;
        --inactive: #bbc1e1;
        display: inline-block;
        vertical-align: top;
        margin: 4px 6px 0 0;
    }
    span {
        display: inline-block;
        vertical-align: top;
    }
    & > span {
        transform: translateX(var(--text-x, 4px));
        transition: transform var(--duration);
        span {
            display: inline-block;
            vertical-align: top;
            opacity: var(--span-opacity, 0);
            transform: translateX(var(--span-x, 4px));
            transition: opacity var(--duration), transform var(--duration);
        }
    }
    &:active {
        --button-scale: .95;
    }
    &:hover {
        --button-color: var(--color-hover);
        --button-border: var(--border-hover);
    }
    &.active {
        --text-x: 0;
        --button-color: var(--color-active);
        --button-border: var(--border-active);
        --button-background: var(--background-active);
        --span-opacity: 1;
        --span-x: 0;
    }
}

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

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

// Center & dribbble
body {
    font-family: 'Inter', Arial;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background: #F6F8FF;
    .heart-button {
        margin-top: 40px;
    }
    .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('.heart, .heart-button').forEach(button => button.addEventListener('click', e => button.classList.toggle('active')));