s-keyword">warn</span> <span class="hljs-string">"grid-columns: #{$grid-columns} is not a number"</span>;</span>
    $valid<span class="hljs-value">: false;</span>
  }
  <span class="hljs-at_rule">@<span class="hljs-keyword">if</span> $valid ==<span class="hljs-preprocessor"> true</span> {</span>
    <span class="hljs-attribute">margin-left</span><span class="hljs-value">: percentage($cols/$grid-columns);</span>
  }
}</pre></div></div>
            
        </li>
        
        
        <li id="section-33"