Bug report: Black bar on top blocks first unread post

When I click on the little circle to navigate to the first unread post in a thread, the black bar on top of the web page always blocks the first line or two of the said first unread post. It's annoying and should be a easy bug fix I would think. Thanks!

 

Thank you!

 

Update: I watched closely what happened when I clicked on the little circle to go to the first unread post. Initially for a second or two the page actually displayed correctly. Then the black bar at the bottom of the page showed up and pushed the rest of the page upwards, thus moving the first line of texts behind the black bar on the top of the page. Hope this helps the debugging.