Fix Arthur CSS

Fixed races, myplanet and defined colours in arthur css
(cherry picked from commit 4dbe50460f65fb6ef5db625fcb59b3fd859b002b by Patfeesh)

Signed-off-by: Martin Stone <martin@d7415.co.uk>
(cherry picked from commit 3b3806d1545f7c3b17790aebf62ab914cb415722)