代码编辑器：
x
1
2
<meta charset="utf-8"><link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 3
<style>4
.button {5
background-color: #4CAF50;6
border: none;7
color: white;8
padding: 15px 32px;9
text-align: center;10
text-decoration: none;11
display: inline-block;12
font-size: 16px;13
margin: 4px 2px;14
cursor: pointer;15
}16
</style>17
<h2>CSS 按钮</h2>18
<button>默认按钮</button>