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<!DOCTYPE html>
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<html>
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<head>
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<style type="text/css">
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#a {
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height: 20px;
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background-color: green;
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}
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#margin {
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height: 20px;
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}
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#b {
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height: 20px;
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background-color: blue;
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}
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</style>
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</head>
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<body>
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<div id="a"></div>
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<div id="margin"></div>
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<div id="b"></div>
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</body>
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</html>
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