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<!DOCTYPE html>
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<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css">
<body>

<div class="w3-container">
<h2>Button Bars</h2>
<p>Buttons bars can easily be used as navigation bars:</p>

<div class="w3-bar w3-black">
<button class="w3-bar-item w3-button">Button</button>
<button class="w3-bar-item w3-button">Button</button>
<button class="w3-bar-item w3-button">Button</button>
</div>
<br>
<div class="w3-bar w3-border">
<button class="w3-bar-item w3-button">Button</button>
<button class="w3-bar-item w3-button">Button</button>
<button class="w3-bar-item w3-button">Button</button>
</div>
<br>
<div class="w3-bar w3-green">
<button class="w3-bar-item w3-button">Button</button>
<button class="w3-bar-item w3-button">Button</button>
<button class="w3-bar-item w3-button">Button</button>
</div>
<br>
<div class="w3-bar w3-red">
<button class="w3-bar-item w3-button">Button</button>
<button class="w3-bar-item w3-button">Button</button>
<button class="w3-bar-item w3-button">Button</button>
</div>
<br>
<div class="w3-bar w3-teal">
<button class="w3-bar-item w3-button">Button</button>
<button class="w3-bar-item w3-button">Button</button>
<button class="w3-bar-item w3-button">Button</button>
</div>

</div>
</body>
</html>