This professional concrete5 theme is geared towards people looking for a slick yet simplistic theme. It has space for two featured blocks at the top, three columns in the footer and a range of page types including a three column layout (in use on this very page). The theme also comes with some additional block styles that can be applied to just about any block on your site

To use the four  coloured blocks (red, green, blue and grey) you need to create your block, then click on it in Edit mode, click "Design", then in the "CSS" tab, enter in one of the following into the