Added better Highlighting for dark mode

Context - https://share.gvine.app/cBCsgwpUBXAaEWuL8

I read a lot hence, I needed a local way to highlight texts and annotate texts. That's the reason I built this simple, easy to use highlighter.

https://chromewebstore.google.com/detail/notestash-highlight-and-a/agflogmfndachlpeicjchgndbcnpbnbk?utm_source=item-share-cb