Demo: Responsive Column Layouts
Tutorial by Nick La, Web Designer Wall (read Responsive Column Layouts)
Resize your browser window to see the columns switch from 4 to 3, then to 2, and full width.
Grid4
Column 1
Column 2
Column 3
Column 4
Column 5
Column 6
Column 7
Column 8
Grid3
Column 1
Column 2
Column 3
Column 4
Column 5
Column 6
Grid2
Column 1
Column 2
Column 3
Column 4
Fullwidth