背景图片实现圆角显示效果的制作方法，让背景图变成圆角矩形，可根据自己的需求来修改即可。
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<div id="b" style="width:150px;height:110px;border:#33aa33;background:#66ff66;margin:20px;padding:10px;">要改变样式，只需在div里写css即可，比如我的背景色、边框色</div>
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<div id="c" style="width:380px;height:280px;background:url(/img/20240222_www_wuming_ren_2.jpg);padding:10px;color:#ffffff">支持背景图，不过只支持平铺方式</div>
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