圆角
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20px圆角
<div style="width:200px; height:100px; border:1px solid red; border-radius:20px;"></div>
20%圆角
<div style="width:200px; height:100px; border:1px solid red; border-radius:20%;"></div>
</body>
50px圆角
<div style="width:200px; height:100px; border:1px solid red; border-radius:50px;"></div>
50%圆角
<div style="width:200px; height:100px; border:1px solid red; border-radius:50%;"></div>
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