[css] 使用css实现彩虹的效果
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>彩虹</title><style>.rainbow-wrap {width: 500px;height: 500px;background-color: red;position: relative;left: 20px;top: 20px;border-radius: 100%;}.rainbow-wrap::after {content: '';width: 500px;height: 250px;background-color: white;position: absolute;bottom: 0;}.rainbow-wrap::before {content: '';width: 200px;height: 200px;background-color: white;position: absolute;bottom: 0;border-radius: 100%;top: 150px;z-index: 10;left: 150px;}.rainbow-wrap .rainbow-item {position: absolute;width: 400px;height: 400px;border-radius: 100%;background-color: yellow;top: 50%;left: 50%;transform: translate(-50%, -50%);}.rainbow-item:nth-child(2) {background-color: blue;width: 300px;height: 300px;}.rainbow-item:nth-child(3) {background-color: green;width: 200px;height: 200px;}</style>
</head>
<body>
<div class="rainbow-wrap"><div class="rainbow-item"></div><div class="rainbow-item"></div><div class="rainbow-item"></div>
</div>
</body>
</html>
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