Example for https://github.com/ofca/dc-template/blob/master/assets/scss/vendor/dc-bootstrap.scss#L21-L53

css.css

.row {
  margin: 0 -5px
}
.col {
  width: 25%;
  padding: 0 5px;
}

html.html

<div class='container'>
  <div class='row'>
    <div class='col'>
      a
    </div>
    <div class='col'>
      b
    </div>
    <div class='col'>
      c
    </div>
    <div class='col'>
      d
    </div>
  </div>
</div>