title: Why am I unable to use Sass-rem for CSS variables?
body: <p>I am trying to use the sass-rem library for converting pixels to rem values.
  It is working fine when I am using it for different CSS properties but when I try to use it in CSS variables as show below then it does not work properly.</p>
  <pre><code>--width: rem(640px);
  width: rem(640px);
  </code></pre>
  <p>on compiling it should be as</p>
  <pre><code>--width: 40rem;
  width: 40rem;
  </code></pre>
  <p>but I still see as</p>
  <pre><code>--width: rem(640px);
  width: 40rem;
  </code></pre>
  <p>if you notice for variables value does not convert to rem.</p>