small SASS grid.

grid.scss

$column-width: 60px;
$gutter-width: 20px;
$line-height: 20px;

@function columns ($columns: 1) {
    @return $columns * ($column-width + $gutter-width) - $gutter-width;
}

@function rows ($lines: 1) {
    @return $line-height * $lines;    
}