keyword">warn</span> <span class="hljs-string">"rem-base: #{$rem-base} 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">width</span><span class="hljs-value">: <span class="hljs-number">100</span>%;</span>
    <span class="hljs-attribute">max-width</span><span class="hljs-value">: $grid-max-width;</span>
    <s