mui-card

形成圆角带边框白色背景区域

Mui v3.4.0 
1900行
.mui-card

{

 font-size: 14px;

 position: relative;

 overflow: hidden;

 margin: 10px;

 border-radius: 2px;

 background-color: white;

 background-clip: padding-box;

 box-shadow: 0 1px 2px rgba(0, 0, 0, .3);

}