Snake Loader using CSS

preview project

html code goes here

				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="loader">
        <span></span>
        <span></span>
        <span></span>
        <span></span>
    </div>
</body>
</html>

CSS code goes here

				
					* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

html,
body {
    display: grid;
    height: 100%;
    place-items: center;
    background: #212121;
}

.loader {
    --loader: rgb(49, 180, 255);
    --loader-size: 30px;
    position: relative;
    width: 100px;
    height: 40px;
    overflow: hidden;
    transition: .5s;
    letter-spacing: 2px
}

.loader span {
    position: absolute;
}

.loader span:nth-child(1) {
    top: 0;
    left: -100%;
    width: 100%;
    height: var(--loader-size);
    background: linear-gradient(90deg, transparent, var(--loader));
    animation: loader-anim1 1s linear infinite;
}

@keyframes loader-anim1 {
    0% {
        left: -100%;
    }

    50%,
    100% {
        left: 100%;
    }
}

.loader span:nth-child(2) {
    top: -100%;
    right: 0;
    width: var(--loader-size);
    height: 100%;
    background: linear-gradient(180deg, transparent, var(--loader));
    animation: loader-anim2 1s linear infinite;
    animation-delay: .25s
}

@keyframes loader-anim2 {
    0% {
        top: -100%;
    }

    50%,
    100% {
        top: 100%;
    }
}

.loader span:nth-child(3) {
    bottom: 0;
    right: -100%;
    width: 100%;
    height: var(--loader-size);
    background: linear-gradient(270deg, transparent, var(--loader));
    animation: loader-anim3 1s linear infinite;
    animation-delay: .5s
}

@keyframes loader-anim3 {
    0% {
        right: -100%;
    }

    50%,
    100% {
        right: 100%;
    }
}

.loader span:nth-child(4) {
    bottom: -100%;
    left: 0;
    width: var(--loader-size);
    height: 100%;
    background: linear-gradient(360deg, transparent, var(--loader));
    animation: loader-anim4 1s linear infinite;
    animation-delay: .75s
}

@keyframes loader-anim4 {
    0% {
        bottom: -100%;
    }

    50%,
    100% {
        bottom: 100%;
    }
}