【学习任务】请完成“彩虹”效果-慕课网

在这里输入代码
<!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>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .father {
            width: 400px;
            height: 400px;
            margin: 40px auto;
            /* border: 1px solid red; */
            position: relative;
        }
        .father .color1 {
            width: 380px;
            height: 380px;
            border-radius: 50%;
            border: 10px solid purple;
        }
        .father .color2 {
            width: 360px;
            height: 360px;
            border-radius: 50%;
            border: 10px solid skyblue;
            position: absolute;
            top: 50%;
            margin-top: -190px;
            left: 50%;
            margin-left: -190px;
        }
        .father .color3 {
            width: 340px;
            height: 340px;
            border-radius: 50%;
            border: 10px solid cyan;
            position: absolute;
            top: 50%;
            margin-top: -180px;
            left: 50%;
            margin-left: -180px;
        }
        .father .color4 {
            width: 320px;
            height: 320px;
            border-radius: 50%;
            border: 10px solid green;
            position: absolute;
            top: 50%;
            margin-top: -170px;
            left: 50%;
            margin-left: -170px;
        }
        .father .color5 {
            width: 300px;
            height: 300px;
            border-radius: 50%;
            border: 10px solid yellow;
            position: absolute;
            top: 50%;
            margin-top: -160px;
            left: 50%;
            margin-left: -160px;
        }
        .father .color6 {
            width: 280px;
            height: 280px;
            border-radius: 50%;
            border: 10px solid orange;
            position: absolute;
            top: 50%;
            margin-top: -150px;
            left: 50%;
            margin-left: -150px;
        }
        .father .color7 {
            width: 260px;
            height: 260px;
            border-radius: 50%;
            border: 10px solid red;
            position: absolute;
            top: 50%;
            margin-top: -140px;
            left: 50%;
            margin-left: -140px;
        }
        .father .mask {
            width: 400px;
            height: 200px;
            position: absolute;
            bottom: 0;
            left: 0;
            background-color: #fff;
        }
    </style>
</head>

<body>
    <div class="father">
        <div class="color1"></div>
        <div class="color2"></div>
        <div class="color3"></div>
        <div class="color4"></div>
        <div class="color5"></div>
        <div class="color6"></div>
        <div class="color7"></div>
        <div class="mask"></div>
    </div>
</body>

</html>
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