SendGrid style-guide grid columns

grid-columns.html

<div class="row">
  <div class="col-1">
    <p>.col-1</p>
  </div>
</div>
<div class="row">
  <div class="col-3">
    <p>.col-3</p>
  </div>
</div>
<div class="row">
  <div class="col-6">
    <p>.col-6</p>
  </div>
</div>