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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8"><link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 
<style>
.button {
    background-color: #4CAF50; /* Green */
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}
.button1 {
    background-color: white; 
    color: black; 
    border: 2px solid #4CAF50;
}
.button2 {
    background-color: white; 
    color: black; 
    border: 2px solid #008CBA;
}
.button3 {
    background-color: white; 
    color: black; 
    border: 2px solid #f44336;
}
.button4 {
    background-color: white;
    color: black;
    border: 2px solid #e7e7e7;
}
.button5 {
    background-color: white;
    color: black;
    border: 2px solid #555555;
}
</style>
<h2>按钮边框颜色</h2>
<p>我们可以使用 border 属性设置按钮边框颜色:</p>
<button class="button button1">Green</button>
<button class="button button2">Blue</button>
<button class="button button3">Red</button>
<button class="button button4">Gray</button>
<button class="button button5">Black</button>
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代码编辑器：

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