Incorrect variable for the grid columns setting.

public/index.html

@@ -251,7 +251,7 @@
       solid backgrounds or dots, stripes, and lines.
     </p>
 
-    <p>You set the rows, columns, and gap with style variables <code>--rows</code>, <code>--columns</code>, and <code>--gap</code> like so:
+    <p>You set the rows, columns, and gap with style variables <code>--rows</code>, <code>--cols</code>, and <code>--gap</code> like so:
 
 <pre class="pad"><code>&lt;grid style="--rows: auto; --cols: 1fr 1fr 1fr; --gap: 1rem;"&gt;</code></pre>