div{
width:200px;
height:200px;
background-clip:padding-box,border-box;
background-origin:padding-box,border-box;
background-image:linear-gradient(135deg,#fff,#fff),
linear-gradient(135deg,blue,#fff,#fff,blue);
border:10px transparent solid;
border-radius:5px
}
效果图









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