The only css grid you need, based on the golden ratio.

golden_ratio.scss

$grid-gutter-width: 30px;

.l-1{
    // larger portion of golden ratio
    width: calc(#{percentage(1/1.618)} - #{$grid-gutter-width / 2});
}
.l-2{
    // Smaller portion of golden ratio
    width: calc(#{percentage(1-1/1.618)} - #{$grid-gutter-width / 2}); 
} 
.l-r{
    float:right;
}
.l-l{
    float:left;
}