使用CSS：not(selector)选择器为每个不是指定元素的元素设置样式。您可以尝试运行以下代码来实现：not选择器
<!DOCTYPE html>
<html>
<head>
<style>
p {
color: red;
}
:not(p) {
color: blue;
}
</style>
</head>
<body>
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
</body>
</html>