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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>Spotlight on texts</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <h1>Hello World</h1>
</body>
</html>

style.css

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*{
    /* Initialization, cancle the margin and padding of elements */
    margin : 0;
    padding: 0;

}

body{
    background-color: #222;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

h1{
    color: #333;
    /* capitalize */
    text-transform: uppercase;
    font-size: 112px;
    position: relative;
}
/* 伪元素 */
h1::after{
    content: "hello world";
    color: transparent;
    position: absolute;
    top: 0;
    left: 0;
    background: linear-gradient(to right, #ff59b3, #fe0000, #ffff01, #40d1d2, #8b059f7d);
    /* change the background so that it fits exactly the text */
    background-clip: text;
    -webkit-background-clip: text;
    /* clip the element so that it becomes a circle: 100 suggests the diameter, 0%, 50% suggests the position of the center of the circle */
    clip-path: circle(100px at 0% 50%);
    /* animation: name, duration, infinite means repeat */
    animation: light 5s infinite;
}

/* define an animation that changes the position of the center of the circle  */
@keyframes light{
    0%{
        clip-path: circle(100px at 0% 50%);
    }
    50%{
        clip-path: circle(100px at 100% 50%);
    }
    100%{
        clip-path: circle(100px at 0% 50%);
    }
}