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  代码在这儿:
 
  <divclass="box">
 
  <spanclass="big"></span>
 
  <spanclass="top"></span>
 
  <spanclass="topR"></span>
 
  </div>
 
  
 
  
 
  
 
  
 
  
 
  body{
 
  display:flex;
 
  justify-content:center;
 
  align-items:center;
 
  .box{
 
  position:relative;
 
  width:400px;
 
  height:400px;
 
  top:200px;
 
  color:lightblue;
 
  .big{
 
  position:absolute;
 
  width:400px;
 
  height:200px;
 
  border-radius:20px;
 
  background-color:currentColor;
 
  bottom:0;
 
  }
 
  .top{
 
  position:absolute;
 
  width:100px;
 
  left:calc((400px-100px)/2);
 
  height:150px;
 
  border-radius:20px20px00;
 
  background-color:currentColor;
 
  top:50px;
 
  }
 
  .top::before{
 
  content:"";
 
  position:absolute;
 
  background-color:lightblue;
 
  height:48px;
 
  width:100px;
 
  left:-100px;
 
  top:102px;
 
  }
 
  .top::before{
 
  content:"";
 
  position:absolute;
 
  background-color:lightblue;
 
  height:48px;
 
  width:100px;
 
  left:-100px;
 
  top:102px;
 
  }
 
  .top::after{
 
  content:"";
 
  position:absolute;
 
  background-color:#fff;
 
  border-radius:0020px0;
 
  height:48px;
 
  width:100px;
 
  left:-100px;
 
  top:102px;
 
  }
 
  .topR{
 
  position:absolute;
 
  background-color:lightblue;
 
  height:48px;
 
  width:100px;
 
  right:50px;
 
  top:152px;
 
  }
 
  .topR::after{
 
  content:"";
 
  position:absolute;
 
  background-color:#fff;
 
  border-radius:00020px;
 
  height:48px;
 
  width:100px;
 
  left:0;
 
  top:0;
 
  }
 
  }
 
  }
 
  一开始我以为只要上下两个圆角矩形拼接就行,NONONO,其实两个圆角相交处还有圆角,一看这个圆角就知道,可以使用白色的圆角矩形覆盖,那么问题来了:
 
  白色的圆角矩形覆盖之后,中间会形成空隙,这个空隙需要蓝色填满。所以思路是这样的:
 
  一、先建立上下两个圆角矩形:
 
  HTML:
 
  <spanclass="big"></span>
 
  <spanclass="top"></span>


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