HTMLify

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background: #151515;
}

.bubbly-button {
    display: inline-block;
    font-size: 1em;
    padding: 1em 2em;
    margin-top: 100px;
    margin-bottom: 60px;
    -webkit-appearance: none;
    appearance: none;
    background-color: #ff0081;
    color: #fff;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    position: relative;
    transition: transform ease-in 0.1s, box-shadow ease-in 0.25s;
}

.bubbly-button::before,
.bubbly-button::after {
    position: absolute;
    content: "";
    display: none;
    width: 140%;
    height: 100%;
    left: -20%;
    z-index: -1000;
    transition: all ease-in-out 0.5s;
    background-repeat: no-repeat;
}

.bubbly-button::before {
    top: -75%;
    background-image: radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, transparent 20%, #ff0081 20%, transparent 30%),
        radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, transparent 10%, #ff0081 15%, transparent 20%),
        radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, #ff0081 20%, transparent 20%);
    background-size: 10% 10%, 20% 20%, 15% 15%, 20% 20%, 18% 18%, 10% 10%, 15% 15%,
        10% 10%, 18% 18%;
}

.bubbly-button::after {
    bottom: -75%;
    background-image: radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, transparent 10%, #ff0081 15%, transparent 20%),
        radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, #ff0081 20%, transparent 20%),
        radial-gradient(circle, #ff0081 20%, transparent 20%);
    background-size: 15% 15%, 20% 20%, 18% 18%, 20% 20%, 15% 15%, 10% 10%, 20% 20%;
}

.bubbly-button:active {
    transform: scale(0.9);
    background-color: #e60074;
    box-shadow: 0 2px 25px rgba(255, 0, 130, 0.2);
}

.bubbly-button.animate::before {
    display: block;
    animation: topBubbles ease-in-out 0.75s forwards;
}

.bubbly-button.animate::after {
    display: block;
    animation: bottomBubbles ease-in-out 0.75s forwards;
}

@keyframes topBubbles {
    0% {
        background-position: 5% 90%, 10% 90%, 10% 90%, 15% 90%, 25% 90%, 25% 90%,
            40% 90%, 55% 90%, 70% 90%;
    }

    50% {
        background-position: 0% 80%, 0% 20%, 10% 40%, 20% 0%, 30% 30%, 22% 50%,
            50% 50%, 65% 20%, 90% 30%;
    }

    100% {
        background-position: 0% 70%, 0% 10%, 10% 30%, 20% -10%, 30% 20%, 22% 40%,
            50% 40%, 65% 10%, 90% 20%;
        background-size: 0% 0%, 0% 0%, 0% 0%, 0% 0%, 0% 0%, 0% 0%;
    }
}

@keyframes bottomBubbles {
    0% {
        background-position: 10% -10%, 30% 10%, 55% -10%, 70% -10%, 85% -10%,
            70% -10%, 70% 0%;
    }

    50% {
        background-position: 0% 80%, 20% 80%, 45% 60%, 60% 100%, 75% 70%, 95% 60%,
            105% 0%;
    }

    100% {
        background-position: 0% 90%, 20% 90%, 45% 70%, 60% 110%, 75% 80%, 95% 70%,
            110% 10%;
        background-size: 0% 0%, 0% 0%, 0% 0%, 0% 0%, 0% 0%, 0% 0%;
    }
}