Add: right/left images for the gray arrow
Change: gray titles + general CSS (see description)

- Background color  of titles in gray with an arrow at the right/left
(depending of the box).
- The header generate a shadow to the bottom
- Border color is a bit different for the information boxes
- Background color for the body in light gray
- body-content got light gray border on right and left
- Napier logo raised by 15px and moved to the right by 30px
- Email address from 40 to 30px