I have an issue with the mobile version of this lay-theme website: http://contour-studio.fr/ on every browser I tried (chrome, safari, firefox).
On mobile, in the menu, the inactive page title "Le studio" is written in black.. on a black background ! It only appears white again when the mouse goes over it on laptop or when you tap and click on it on a mobile.
I was trying to figure out what was going on and I discovered that this problem appeared also in the desktop version when I selected the "Default" option in [Primary Menu -> Text Format]. Instead, selecting just the above option "--SELECT--" as the text format solved the issue (for the desktop version).
By the way , thanks for this great theme and for the support !