代码编辑器:
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" href="/static/lib/bootstrap/4.0.0/css/bootstrap.min.css">
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<script src="/static/lib/jquery/3.3.1/jquery.min.js"></script>
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<script src="/static/lib/bootstrap/4.0.0/js/bootstrap.min.js"></script>
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<style>
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.border {
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display: inline-block;
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width: 70px;
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height: 70px;
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margin: 6px;
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}
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</style>
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<div class="container">
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<p>使用 .border 类可以添加或移除边框</p>
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<span class="border"></span>
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<span class="border border-0"></span>
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<span class="border border-top-0"></span>