@amarinelli this forum uses the master branch... it's probably fixed in some recent version.
I would suggest you upgrade to atleast v0.9.4 and check if the issue still exists. If it does then you will have to wait until v1.0.0 is released.
Hello what is this white background behind my menu and how to get rid of it ? It appear suddently and i do not know how to fix this . My version is NodeBB v0.7.1
Apply these changes https://github.com/NodeBB/NodeBB/commit/8c9bae8ba388f94750130819106d240e90715be7, or upgrade to latest version of NodeBB.