Removes class yellow from kbd element.

Author: mrmrs

docs/typography/vertical-align/index.html

@@ -150,7 +150,7 @@ <h1 class="f4 ttu tracked fw6">Reference</h1>
       </div>
       <section class="bg-near-white black-70 pt4 pb5 overflow-container">
         <header class="ph3 ph5-ns pt4">
-          <kbd class="yellow">src/_vertical-align.css</kbd>
+          <kbd>src/_vertical-align.css</kbd>
         </header>
 <pre class="ph3 ph5-ns">
 <code class="code" style="font-size: .75rem;">