It's work just like Twitter Bootstrap, but with less code.

It's pretty simple to use, choose the number of column and give them the right class :

<div class="container">
    <div class="row">
        <div class="span3"></div>
        <div class="span3"></div>
        <div class="span3"></div>
        <div class="span3 last"></div>
    </div>
    <div class="row">
        <div class="span3"></div>
        <div class="span2 offset4"></div>
        <div class="span3 last"></div>
    </div>
</div>

.container is the block who content all your rows
.row is just like his name, he contains the column of your layout
.span1 or .offset1 = one column
.last is the required class for the last column

@maxWidth is the max width of your grid
@columnRatio is the proportion between column and gutter

With this two parameters, you can make the grid just like you want.

For abvanced user, juste change @columnNumber and add few lines for /* SPAN WIDTH */ and /* OFFSET WIDTH */