ISSUE: image impression on the header background

[MimanshaKaur]

Found a bug? Please fill out the sections below. 👍

Current Behaviour

• the impression of the images added on the page is visible on the header nav-bar on scrolling.

Expected Behaviour

• the background should not be transparent of the header so that this image's impression is not there.

Screenshot

Proposed Solution

• i will change the background CSS for both dark and light themes.

@multiverseweb i want to work on this issue . kindly add labels of gssoc-ext and hacktoberfest-accepted on assigning.