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

body {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000000;
    min-height: 100vh;
}

a {
    position: relative;
    text-transform: uppercase;
    height: 200px;
    padding: 20px 50px;
    text-decoration: none;
    display: block;
    border-radius: 50px;
    overflow: hidden;
    width: 300px;
}

a span {
    color: #710909;
    z-index: 1;
    position: relative;
    font-size: 20px;
    font-weight: 600;
}

a .liquify {
    position: absolute;
    left: 0;
    top: -40px;
    width: 300px;
    height: 350px;
    background: #710909;
    transition: 1s;
    box-shadow: inset 0 0 30px rgba(0, 0, 0, .8);
}

a .liquify::after,
a .liquify::before {
    position: absolute;
    content: '';
    top: 0;
    left: 50%;
    width: 200%;
    height: 180%;
    background: #000;
    transform: translate(-90%, -95%);
}

a .liquify::before {

    border-radius: 45%;
    background: rgb(26, 25, 25);
    animation: flow 6s linear infinite;
}

a .liquify::after {

    border-radius: 40%;
    background: rgba(0, 0, 0, 0.1);
    animation: flow 6s linear infinite;
}

a:hover .liquify{
    top: -140px; 
}

@keyframes flow {
    0% {
        transform: translate(-50%, -75%) rotate(0deg);
    }

    100% {
        transform: translate(-50%, -75%) rotate(360deg);
    }
}