<button class="button">
    <span>Add to cart</span>
    <div class="cart">
        <svg viewBox="0 0 36 26">
            <polyline points="1 2.5 6 2.5 10 18.5 25.5 18.5 28.5 7.5 7.5 7.5"></polyline>
            <polyline points="15 13.5 17 15.5 22 10.5"></polyline>
        </svg>
    </div>
</button>

<!-- dribbble - twitter -->
<a class="dribbble" href="https://dribbble.com/shots/9713067-Add-to-cart" 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>
.button {
    --background: #362A89;
    --text: #fff;
    --cart: #fff;
    --tick: var(--background);
    position: relative;
    border: none;
    background: none;
    padding: 8px 28px;
    border-radius: 8px;
    -webkit-appearance: none;
    -webkit-tap-highlight-color: transparent;
    -webkit-mask-image: -webkit-radial-gradient(white, black);
    overflow: hidden;
    cursor: pointer;
    text-align: center;
    min-width: 144px;
    color: var(--text);
    background: var(--background);
    transform: scale(var(--scale, 1));
    transition: transform .4s cubic-bezier(.36, 1.01, .32, 1.27);
    &:active {
        --scale: .95;
    }
    span {
        font-size: 14px;
        font-weight: 500;
        display: block;
        position: relative;
        padding-left: 24px;
        margin-left: -8px;
        line-height: 26px;
        transform: translateY(var(--span-y, 0));
        transition: transform .7s ease;
        &:before,
        &:after {
            content: '';
            width: var(--w, 2px);
            height: var(--h, 14px);
            border-radius: 1px;
            position: absolute;
            left: var(--l, 8px);
            top: var(--t, 6px);
            background: currentColor;
            transform: scale(.75) rotate(var(--icon-r, 0deg)) translateY(var(--icon-y, 0));
            transition: transform .65s ease .05s;
        }
        &:after {
            --w: 14px;
            --h: 2px;
            --l: 2px;
            --t: 12px;
        }
    }
    .cart {
        position: absolute;
        left: 50%;
        top: 50%;
        margin: -13px 0 0 -18px;
        transform-origin: 12px 23px;
        transform: translateX(-120px) rotate(-18deg);
        &:before,
        &:after {
            content: '';
            position: absolute;
        }
        &:before {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            box-shadow: inset 0 0 0 2px var(--cart);
            bottom: 0;
            left: 9px;
            filter: drop-shadow(11px 0 0 var(--cart));
        }
        &:after {
            width: 16px;
            height: 9px;
            background: var(--cart);
            left: 9px;
            bottom: 7px;
            transform-origin: 50% 100%;
            transform: perspective(4px) rotateX(-6deg) scaleY(var(--fill, 0));
            transition: transform 1.2s ease var(--fill-d);
        }
        svg {
            z-index: 1;
            width: 36px;
            height: 26px;
            display: block;
            position: relative;
            fill: none;
            stroke: var(--cart);
            stroke-width: 2px;
            stroke-linecap: round;
            stroke-linejoin: round;
            polyline {
                &:last-child {
                    stroke: var(--tick);
                    stroke-dasharray: 10px;
                    stroke-dashoffset: var(--offset, 10px);
                    transition: stroke-dashoffset .4s ease var(--offset-d);
                }
            }
        }
    }
    &.loading {
        --scale: .95;
        --span-y: -32px;
        --icon-r: 180deg;
        --fill: 1;
        --fill-d: .8s;
        --offset: 0;
        --offset-d: 1.73s;
        .cart {
            animation: cart 3.4s linear forwards .2s;
        }
    }
}

@keyframes cart {
    12.5% {
        transform: translateX(-60px) rotate(-18deg);
    }
    25%,
    45%,
    55%,
    75% {
        transform: none;
    }
    50% {
        transform: scale(.9);
    }
    44%,
    56% {
        transform-origin: 12px 23px;
    }
    45%,
    55% {
        transform-origin: 50% 50%;
    }
    87.5% {
        transform: translateX(70px) rotate(-18deg);
    }
    100% {
        transform: translateX(140px) rotate(-18deg);
    }
}

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: 'Inter UI', 'Inter', 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;
        }
    }
}
View Compiled
document.querySelectorAll('.button').forEach(button => button.addEventListener('click', e => {
    if(!button.classList.contains('loading')) {

        button.classList.add('loading');

        setTimeout(() => button.classList.remove('loading'), 3700);

    }
    e.preventDefault();
}));

External CSS

  1. https://cdn.jsdelivr.net/npm/inter-ui@3.11.0/inter.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.