GitLab page style (css,js,..) is not working after installation

We have setup gitLab server and we’ve configured DNS to access that. It seems that the CSS and JS files are not loaded. The forms are all working fine but working with pure HTML website is a bit tedious. We’re using apache2 web server.
We also tried sudo gitlab-ctl reconfigure and
sudo gitlab-ctl restart. But nothing happened.
We would be grateful if you could help us. Thank you.