HTML+CSS: Loading Animation

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loadingAnimation

index.html

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Interesting Loading Animation</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="loading">
        <span>loading..</span>
    </div>
</body>
</html>

style.css

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*{
    /* initialization, defining the margin and padding */
    margin: 0;
    padding: 0;
}

body{
    /* 100% window height */
    height: 100vh;
    /* gradient background  */
    background: linear-gradient(to bottom, #2b6876, #09203f);
    display: flex;
    /* center at the main axis, which is horizontally */
    justify-content: center;
    /* center flex items along the cross axis of the current line of the flex container */
    align-items: center;
}

.loading{
    width: 200px;
    height: 200px;
    /* this tells the browser that the sum of padding and margin of the box is 200px */
    box-sizing: border-box;
    border-top: 10px solid #63a69f;
    border-radius: 50%;
    position: relative;
    animation: a1 2s linear infinite;
}

.loading::after,.loading::before{
    content: "";
    width: 200px;
    height: 200px;
    position: absolute;
    left: 0;
    top: -10px;
    box-sizing: border-box;
    border-radius: 50%;
}

.loading::after{
    border-top: 10px solid #f2e1ac;
    transform: rotate(240deg);
}

.loading::before{
    border-top: 10px solid #f2836f;
    transform: rotate(120deg);
}

.loading span{
    position: absolute;
    width: 200px;
    height: 200px;
    line-height: 200px;
    text-align: center;
    color: beige;
    animation: a2 2s linear infinite;
    font-size: larger;
}

@keyframes a1 {
    to{
        transform: rotate(360deg);
    }
}

@keyframes a2 {
    to{
        transform: rotate(-360deg);
    }
}