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正确
<style>
h1 {
margin: @(2)px @(2)px @(2)px @(2)px;
}
</style>
<body>
<h1>This is a heading</h1>
<p>This is a paragraph</p>
<p>This is a paragraph</p>
</body>
<style>
h1 {
margin: 20px 15px 25px 10px;
}
</style>
<body>
<h1>This is a heading</h1>
<p>This is a paragraph</p>
<p>This is a paragraph</p>
</body>
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<style>
h1 {
margin:
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