Generally, the brighter the color, the further down you are. Main Page yellow background. This is the uppermost level. Work Pages about my work are in light yellow. Alps The main Alps menu is in light green.
Expedition reports, maps, and practical hints have a bright blue background.
Trip reports in the Alps are in lighter green. Also the single info pages are in lighter green. On the top and bottom of each page you find a navigation bar that allows you to go one or more levels up. Just from the colors you can see if you move on the same level, or one or more levels up.