This is a twelve column section in a row. Each of these includes a div.panel element so you can see where the columns are - it's not required at all for the grid.
Six columns
Six columns
Four columns
Four columns
Four columns
The grid is built up out of row and columns. When you resize your browser window to the size of a mobile device, all adjacent columns are positioned underneath each other.
To use this grid in your websites, please follow the guidelines in the document below.