We have deployed a Kolab16 server.

Our users reports us that link insertion on email HTML composition don't work. We have take a look to the issue and appears that the button "OK" (insert/edit link) appears without borders and with white font colour so it's very difficult to see. The functionality works, the problem appears to be cosmetic because the users don't see the button.

We use default theme configuration on Kolab16.

Actual results: Button "OK" for link insertion on mail composer appears without borders and with white font. The users can't see it (it works but regular users don't find where to accept)

Expected results: Button "Ok" for link insertion with borders and regular font color

Platform: CentOS Linux release 7.6.1810 (Core)
Kolab version:
roundcubemail-1.4-243.1.el7.kolab_16.noarch
kolab-server-0.8.11-8.1.el7.kolab_16.noarch