Quick, dirty and minimal CSS Grid Generator

Gridify (Sass)

/* Column placeholder */
%column {

    display: inline-block;
    vertical-align: top;

}

$column-count: 12;

@for $i from 1 through $column-count {
    [class~="span-#{$i}/#{$column-count}"] {
        @extend %column;
        width: percentage($i/$column-count);
    }
}