Fix grid layout examples for IE7 and below

- Reduce the width of example boxes for IE7 and below
- Recalculate widths for grid columns within example boxes
- Scale images to fit grid columns
- Use height rather than min-height to maintain example grid height
Set a colour for form labels

This isn’t inherited and is appearing in blue in IE7 and below, set a
colour to fix this.
Fix bulleted lists in IE7 and below

Use padding rather than margin so bullets are visible