AS: Light theme header area readability

Hi @Antoine

Please take a look at these header section images.
When app is in light theme, the black and grey text colour over that backdrop is hard to read.
Perhaps we either have to make the backdrop quite a bit lighter or make the text colour white (same as in dark theme).
There is also an overlap issue here.

AS 1.3 fixes the overlapping issue. Thanks @Antoine!
Does not fix the light theme readability issue.