Gitlab installation on company server

Good morning all ! I installed gitlab-ce on my company’s server: I am having display problems on the site administration pages they are in raw html the css is not taken into account and I cannot find any explanation for my problem on the internet.
can you help me please ?

Need more information. How are you doing this? This sounds to be like a proxy redirect to handle the connection and it is going from HTTPS to HTTP, hence white text, and no images. Screenshot would help, as well as more information about your configuration. Unable to help otherwise.

In addition to information