Button-Snake.css

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

#button-snake{
    margin: 0;
    padding: 0;
    height: 50vh;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Poppins', sans-serif;
    background: #0c002b;
}

#button-snake a{
    padding: 12px 30px;
    left: 6%;
    transform: translate(-50%, -50%);
    position: relative;
    color: #1670f0;
    font-size: 30px;
    letter-spacing: 2px;
    text-transform: uppercase;
    text-decoration: none;
    box-shadow: 0 20px 50px rgba(0, 0, 0,.5);
    overflow: hidden;
}

#button-snake a:before{
    content:"";
    position: absolute;
    top: 2px;
    left: 2px;
    bottom: 2px;
    width: 50%;
    background: rgba(255, 255, 255, 0.05);
}

#button-snake 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%);
    }
}

#button-snake 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%);
    }
}

#button-snake a span:nth-child(3) {
    position: absolute;
    bottom: 0;
    left: 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%);
    }
}

#button-snake 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%);
    }
}