作业2html：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>minecraft</title>
<link rel="stylesheet" href="a.css">
</head>
<body>
<div class="bg">
<div class="cobble"></div>
<div class="stonebrick">
<div class="inner_cobble">
</div>
<div class="fire">
<div class="bars">
</div>
</div>
</div>
</div>
</div>
</body>
</html>
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