使用方法:
1、head引入css文件
<link rel="stylesheet" href="css/style.css">
2、body引入HTML代码
<div class="card"> <div class="text"> <h1>build</h1> <span>Nothing will change until you start building.</span> <!--阶梯--> <div class="bg-transparent left"></div> <div class="bg-transparent center"></div> <div class="bg-transparent right"></div> </div> </div>