实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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<head>
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<style>
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#main {
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  width: 140px;
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  height: 300px;
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  border: 1px solid #000000;
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  display: flex;
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  flex-flow: row wrap;
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  align-content: space-around;
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}
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​
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#main div {
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  width: 70px;
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  height: 70px;
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}
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</style>
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</head>
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<body>
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​
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<div id="main">