 </section>
          <section>
            <iframe width="100%" height="600" data-src="/ch7.html">
            </iframe>
          </section>


          <!-- Adding Textures -->
          <section>
            <h1>Adding Textures</h1>
          </section>
          <section>
            <img src="/images/tiles.jpg" />
          </section>
          <section>
            <pre><code>
$tiles: '../images/tiles.jpg';

%pseudo-block {
  ...
  background: 0px 0px/400px url($tiles);
  background-blend-mode: multi