Begin by carefully examining a generated page (or test page) and look for some identifying text in the sidebar, near the errant border. Let’s say that listed in the sidebar, you have a post title called „All About Harry“. You know you’ll find that title in your sidebar when you view the page’s source code.
To view a page’s source code, go up to the menu bar of your browser and choose VIEW > PAGE SOURCE or VIEW > SOURCE. A page will pop up featuring the source code of the page.
Use your handy detective tool, Ctrl+F, to activate your search. Type in „all about harry“ and click FIND. Odds are, unless you have the words „all about harry“ in your post, it will take you to the first showing of the phrase „all about harry“ which is probably in your sidebar. If not, hit FIND again until you’ve found the right phrase in the right area.