// Custom Grid System
$grid_width : 960px;
$grid_col   : 12;
$grid_gut   : 20px;
body { min-width: $grid_width; }
.container_#{$grid_col} { margin-left: auto; margin-right: auto; width: $grid_width;
  @for $i from 1 through $grid_col {
    .grid_#{$i} { display: inline; float: left; margin-left: $grid_gut / 2; margin-right: $grid_gut / 2; }
    .push_#{$i}, .pull_#{$i} { position: relative; }
    .grid_#{$i} { width: ( ($grid_width / $grid_col - $grid_gut) * $i ) + (($i - 1) * $grid_gut); }
    .prefix_#{$i} { padding-left: $grid_width / $grid_col * $i ; }
    .suffix_#{$i} { padding-right: $grid_width / $grid_col * $i ; }
    .push_#{$i} { left: $grid_width / $grid_col * $i ; }
    .pull_#{$i} { right: $grid_width / $grid_col * $i ; }
  }
  .alpha { margin-left: 0; } // no left margin
  .omega { margin-right: 0; } // no right margin
}

You just need to configure the width, columns, and gutter

Grid System on SASS

css

SASS