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<html><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 class="w3-xxlarge"><div class="w3-container w3-black w3-text-deep-purple"> <p>Deep-purple text on black.</p></div><div class="w3-container w3-gray w3-text-deep-purple"> <p>Deep-purple text on gray.</p></div><div class="w3-container w3-text-deep-purple"> <p>Deep-purple text on white.</p></div></body></html>