box-shadow里inset为0

在CSS的box-shadow属性中，inset用于指定阴影是内部阴影还是外部阴影。当inset的值为0时，表示阴影是外部阴影，不是内部阴影。这意味着阴影会被绘制在元素的边界之外，而不是在元素的内部。具体来说，当设置box-shadow属性时省略inset或将其值设为0，阴影将被渲染为外部阴影。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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