Layout Grid System, and positioning

There's a basic 12 column grid that's percent based. Rows and columns can be nested, and the box sizing property is set to: border-box

<% include _layout_grid %>

<% include _layout_nestedgrid %>

<% include _layout_responsivegrid %>

<% include _layout_position %> <% include _layout_box %> <% include _layout_heightwidth %> <% include _layout_containers %>