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<h1>应用 w3-colors-safety</h1>
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<p><div class="w3-tag w3-safety-red w3-xxlarge">禁止</div></p>
<p><div style="color:#000" class="w3-tag w3-safety-yellow w3-xxlarge">注意</div></p>
<p><div class="w3-tag w3-safety-green w3-xxlarge">通行</div></p>
<p><div class="w3-tag w3-safety-blue w3-xxlarge">指令</div></p>
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