fathom/assets/sass/_grid.scss

$col-width: 100 / 6;

@media( min-width: 680px ) {
  .row {
    margin-left: -10px;
    margin-right: -10px;

    &:before,
    &:after {
        content: " ";
        display: table;
    }

    &:after {
        clear: both;
    }
  }

  .col,
  .col-1,
  .col-2,
  .col-3,
  .col-4,
  .col-5,
  .col-6 {
    float: left;
    padding-left: 10px;
    padding-right: 10px;
    box-sizing: border-box;
  }

  .col-1 {
    width: $col-width + 0%;
  }

  .col-2 {
    width: $col-width * 2 + 0%;
  }

  .col-3 {
    width: $col-width * 3 + 0%;
  }

  .col-4 {
    width: $col-width * 4 + 0%;
  }

  .col-5 {
    width: $col-width * 5 + 0%;
  }

  .col-6 {
    width: 100%;
  }
}