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copied!<p>Start with a basic square and borders. Each border will be given a different color so we can tell them apart:</p> <pre class="lang-css prettyprint-override"><code>.triangle { border-color: yellow blue red green; border-style: solid; border-width: 200px 200px 200px 200px; height: 0px; width: 0px; } </code></pre> <p>which gives you <a href="http://jsbin.com/axoyub/5/edit">this</a>:</p> <p><a href="http://jsbin.com/axoyub/5/edit"><img src="https://i.stack.imgur.com/QH01k.png" alt="square with four borders"></a></p> <p>But there's no need for the top border, so set its width to <code>0px</code>. Now our border-bottom of <code>200px</code> will make our triangle 200px tall.</p> <pre class="lang-css prettyprint-override"><code>.triangle { border-color: yellow blue red green; border-style: solid; border-width: 0px 200px 200px 200px; height: 0px; width: 0px; } </code></pre> <p>and we will get <a href="http://jsbin.com/efihoq/2/edit">this</a>:</p> <p><a href="http://jsbin.com/efihoq/2/edit"><img src="https://i.stack.imgur.com/3gohz.png" alt="bottom half of square with four borders"></a></p> <p>Then to hide the two side triangles, set the border-color to transparent. Since the top-border has been effectively deleted, we can set the border-top-color to transparent as well.</p> <pre class="lang-css prettyprint-override"><code>.triangle { border-color: transparent transparent red transparent; border-style: solid; border-width: 0px 200px 200px 200px; height: 0px; width: 0px; } </code></pre> <p>finally we get <a href="http://jsbin.com/aluhik/2/edit">this</a>:</p> <p><a href="http://jsbin.com/aluhik/2/edit"><img src="https://i.stack.imgur.com/k9EQ8.png" alt="triangular bottom border"></a></p>

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