 classes are necessary for full-width elements.</p>

      <hr>

      <h3>Two columns with two nested columns</h3>
      <p>Per the documentation, nesting is easyâ€”just put a row of columns within an existing column. This gives you two columns <strong>starting at desktops and scaling to large desktops</strong>, with another two (equal widths) within the larger column.</p>
      <p>At mobile device sizes, tablets and down, these columns and their nested columns will stack.</p>
      <div class="row">
