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Page Widget - 如何设置边框半径以创建圆边框...

border 【border】
我们想知道如何设置边框半径以创建圆边框。...
代码展示 运行结果 

<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.box {
  border: solid 3px blue;
  border-left-color: red;
  border-right-color: red;
  width: 200px;
  height: 200px;
  position: relative;
}

.box:before {
  content: "";
  position: absolute;
  border-top: 3px solid blue; // save color as the .box
  width: 106px;
  left: -3px;
  top: -3px;
}
</style>
</head>
<body>
  <div class="box"></div>
</body>
</html>