HTML-CSS-7.--Snake-Border-Animation/style.css at master · businessOS/HTML-CSS-7.--Snake-Border-Animation · GitHub

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body{
    margin: 0;
    padding: 0;
    background: #0c002b;
    font-family: sans-serif;
}

a {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #1670f0;
    padding: 30px 60px;
    font-size: 30px;
    letter-spacing: 2px;
    text-transform: uppercase;
    text-decoration: none;
    box-shadow: 0 20px 50px rgba(0, 0, 0, .5);
    overflow: hidden;
}

a::before{
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    bottom: 2px;
    right: 2px;
    width: 50%;
    background: rgba(255,255,255,0.05);
}

a span:nth-child(1){
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, #0c002b, #1779ff );
    animation: animate1 2s linear infinite;
}
@keyframes animate1 {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

a span:nth-child(2){
    position: absolute;
    top: 0;
    right: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom, #0c002b, #1779ff );
    animation: animate2 2s linear infinite;
    animation-delay: 1s;
}
@keyframes animate2 {
    0% {
        transform: translateY(-100%);
    }
    100% {
        transform: translateY(100%);
    }
}

a span:nth-child(3){
    position: absolute;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to left, #0c002b, #1779ff );
    animation: animate3 2s linear infinite;
}
@keyframes animate3 {
    0% {
        transform: translateX(100%);
    }
    100% {
        transform: translateX(-100%);
    }
}
a span:nth-child(4){
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(to top, #0c002b, #1779ff );
    animation: animate4 2s linear infinite;
    animation-delay: 1s;
}
@keyframes animate4 {
    0% {
        transform: translateY(100%);
    }
    100% {
        transform: translateY(-100%);
    }
}