
        </section>
        <section>
          <h2>SCSS</h2>
          <pre><code>
            %pseudo-block {
              width: 100px;
              height: 200px;
              box-sizing: border-box;
              backface-visibility: hidden;
              content: '';
            }

            .bottom, .top, .back, .front, .left, .right {
              @extend %pseudo-block;
            }
          </code></pre>
        </section>
        <section>
          <h2>THREE JS Objects</h2>
          <pre