DivIt // CSS Grid-system 

DivIt it’s a simple grid-system, but is powerful because it lets you create percentual grids that resize by the size of its container.

Understanding CSS Positioning part 1 

Without a doubt, positioning, or the layout, is the hardest part of CSS. Not only because it ever so often varies between browsers, but also because CSS has a lot of ways to position an element, all with various (dis) advantages. This part will introduce the positioning and display property.