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<h2>Full-width Buttons (w3-button)</h2>
<p>The <strong>w3-block</strong> class creates a full-width button.</p>
<p><button class="w3-button w3-block w3-black">Button</button></p>
<p><button class="w3-button w3-block w3-teal">Button</button></p>
<p><button class="w3-button w3-block w3-red w3-left-align">Button</button></p>
<h2>Full-width Buttons (w3-btn)</h2>
<p><button class="w3-btn w3-block w3-black">Button</button></p>
<p><button class="w3-btn w3-block w3-teal">Button</button></p>
<p><button class="w3-btn w3-block w3-red w3-left-align">Button</button></p>
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