Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
<style id="jsbin-css">
/*边框*/
p,span{
/*   background-color: red; */
  width: 100px;
  height: 40px;
/*   border-width: 6px; */
  border-color: yellow;
/*   border-style: dotted; */
/*   dashed /dotted*/
/*   border:2px blue solid; */
  border-bottom: none;
  border-bottom:1px black dotted;
}
</style>
</head>
<body>
  <p>shuye100</p>
  <span>11111</span>


</body>
</html>