HTMLify

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0 auto;
    height: 100%;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #1d212b;
    font-family: monospace;
}

.card {
    position: relative;
    width: 30vw;
    height: 30vw;
    display: flex;
    background-color: #151823;
    border-radius: 50%;
}

.card::after {
    position: absolute;
    content: "";
    top: 0;
    left: 0;
    right: 0;
    z-index: -1;
    height: 100%;
    width: 100%;
    margin: 0 auto;
    transform: scale(0.75);
    -webkit-filter: blur(5vw);
    -moz-filter: blur(5vw);
    -ms-filter: blur(5vw);
    filter: blur(5vw);
    background: linear-gradient(270deg, #0fffc1, #7e0fff);
    background-size: 200% 200%;
    animation: animateGlow 7s ease infinite;
}

.card h1 {
    color: #252b37;
    margin: auto;
    letter-spacing: 3px;
    text-transform: uppercase;
    animation: textColor 7s ease infinite;
}

@keyframes animateGlow {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

@keyframes textColor {
    0% {
        color: #7e0fff;
    }

    50% {
        color: #0fffc1;
    }

    100% {
        color: #7e0fff;
    }
}