Degraded table with SASS (opacity method)

sass-degraded-table.scss

$columns: 30;
$green: rgb(92, 184, 92);

@mixin table-td-list {
  @for $i from 1 through $columns {
      $opacity: (1 / $i);
      .table-td-#{$i} { background: rgba($green, $opacity); }
  }
}

@include table-td-list;