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右侧有30px阴影
<div style="100px; height:50px; background-color:#6F3; box-shadow:30px 0px gray;"></div>
下侧30px有阴影
<div style="100px; height:50px; background-color:#6F3; box-shadow:0px 30px gray;"></div><br />
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右下侧各有30px阴影
<div style="100px; height:50px; background-color:#6F3; box-shadow:30px 30px gray;"></div><br />
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右下侧各有30px阴影并且虚化10px
<div style="100px; height:50px; background-color:#6F3; box-shadow:30px 30px 10px gray;"></div>
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右下侧各有30px阴影并且虚化10px，但是超出部分不显示，仅仅显示在外边框内部的部分，颜色进行互换
<div style="100px; height:50px; background-color:#6F3; box-shadow:30px 30px 10px gray inset;"></div>
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