• Background color makes everything else on the page difficult to see. A white background with colorful logos and navigation is okay!
• Font size for the navigation menu is a bit small.
• Don't forget you can use Google Fonts to enhance your design.
• Logo and Navigation Bar should take up less vertical space on the page so that your products have the majority of screen space. Perhaps put the logo and nav bar on the same line?

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There is a lot of code here that is not being used in your HTML files. If you are looking to have an advanced navigation menu, there are many tutorials that show you how to implement only the necessary code without needing to copy another page's CSS file using Developer Tools. Here is one example from W3 Schools that you can customize to your liking: How To - Dropdown Navbar

Great use of <div> classes!

• Lines 11-40: This can be simplified if you edit your CSS code as mentioned above.
• Lines 69-71: There seems to be an extra <div> element here.