我的页脚未正确显示 CSS 属性。

我尝试更改高度、重量、填充、溢出，但没有任何改变。 代码如下

.footer { background-color: black; height: auto; width: 100%; padding-top: 40px; color: #fff; overflow: auto; padding: 20px; float: left; }

      
  
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