如何创建嵌套div的重复彩虹是CSS
创建嵌套div的重复彩虹可以通过CSS的线性渐变（linear gradient）来实现。下面是一个示例代码：
<!DOCTYPE html>
<html>
<head>
<style>
.rainbow {
height: 200px;
background: linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet);
}
.nested-div {
height: 50px;
margin: 10px;
background: linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet);
}
</style>
</head>
<body>
<div class="rainbow">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
<div class="nested-div">
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>在上面的示例中，我们使用了两个CSS类来创建嵌套的div和重复彩虹效果。.rainbow类用于创建一个高度为200px的div，并使用线性渐变来定义背景色，从红色到紫罗兰色。.nested-div类用于创建一个高度为50px的嵌套div，并同样使用线性渐变来定义背景色。通过多次嵌套.nested-div类，我们可以创建出重复彩虹的效果。
请注意，这只是一个示例代码，实际应用中可以根据需求进行适当的调整和修改。
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