CSS-Button-Effect/Liquid-button.css at master · PriontoAbdullah/CSS-Button-Effect · GitHub

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@import url('https://fonts.googleapis.com/css?family=Poppins:400,500,600,700,800,900&displayer=swap');

#liquid-button{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 50vh;
    font-family: 'Poppins', sans-serif;
    background: #0c0c0c;
}

#liquid-button a {
    position: relative;
    padding: 20px 50px;
    display: block;
    text-decoration: none;
    text-transform: uppercase;
    left: 3%;
    overflow: hidden;
}

#liquid-button a span {
    position: relative;
    z-index: 5;
    color: #fff;
    font-size: 20px;
    letter-spacing: 8px;
    text-align: center;
}

#liquid-button a .liquid {
    position: absolute;
    left: 0;
    top: -80px;
    width: 200px;
    height: 200px;
    background: #4973ff;
    box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.5);
    transition: 0.5s;
}

#liquid-button :hover .liquid {
    top: -120px;
}

#liquid-button a .liquid::before,
#liquid-button a .liquid::after {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    top: 0;
    left: 50%;
    transform: translate(-50%, -75%);
}

#liquid-button a .liquid::before {
    border-radius: 45%;
    background: rgba(20, 20, 20, 1);
    animation: animate-liquid 5s linear infinite;
}

#liquid-button a .liquid::after {
    border-radius: 40%;
    background: rgba(20, 20, 20, 0.5);
    animation: animate-liquid 10s linear infinite;
}

@keyframes animate-liquid {
    0% {
        transform: translate(-50%, -75%) rotate(0deg);
    }
    100% {
        transform: translate(-50%, -75%) rotate(360deg);
    }
}