通过flex:1及margin-top来实现flex布局的重叠
<div id="cont" style="height:500px;display:flex;flex-direction: column;flex:1;"> <div style="height:500px;background-color:red;">bootom</div> <div style="margin-top:-140px;background-color:yellow;height:100px;">top</div> </div>
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