在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://cdn.staticfile.org/font-awesome/4.7.0/css/font-awesome.css">
</head>
<body>
 
<span class="fa-stack fa-lg">
  <i class="fa fa-circle-thin fa-stack-2x"></i>
  <i class="fa fa-twitter fa-stack-1x"></i>
</span>
fa-twitter on fa-circle-thin<br>
 
<span class="fa-stack fa-lg">
  <i class="fa fa-circle fa-stack-2x"></i>
  <i class="fa fa-twitter fa-stack-1x fa-inverse"></i>
</span>
fa-twitter (inverse) on fa-circle<br>
 
<span class="fa-stack fa-lg">
  <i class="fa fa-camera fa-stack-1x"></i>
  <i class="fa fa-ban fa-stack-2x text-danger" style="color:red;"></i>
</span>
fa-ban on fa-camera
 
</body>
</html>
源代码

动行结果
