Fix CSS Overlap Issue

I'm seeking an experienced HTML/CSS developer to resolve styling inconsistencies on my website. Specifically, the sub-menu in my sidebar menu is getting overlapped, and I need this fixed for a cleaner, more professional look.

Ideal skills and experience:
- Strong proficiency in HTML and CSS
- Experience with sidebar menus and sub-menus
- Ability to troubleshoot and resolve styling inconsistencies
- Attention to detail and a good eye for design