Button/style.css at master · Saharij/Button · GitHub

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body {
    background-color: #000;
    margin: 0;
    padding: 0;
}

a {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 60px;
    text-align: center;
    line-height: 60px;
    color: #fff;
    font-size: 24px;
    text-transform: uppercase;
    text-decoration: none;
    font-family: sans-serif;
    box-sizing: border-box;
    background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
    background-size: 400%;
    border-radius: 30px;
}

a:hover
{
    animation: animate 8s linear infinite;
}

@keyframes animate
{
    0%
    {
        background-position: 0%;
    }
    100%
    {
        background-position: 400%;
    }
}

a:before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    z-index: -1;
    background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
    background-size: 400%;
    border-radius: 40px;
    filter: blur(20px);
    opacity: 0;
    transition: 0.3s;
}

a:hover:before {
    filter: blur(20px);
    opacity: 1;
    animation: animate 8s linear infinite;
}