CSS State Retention and Default Page Issue

# Issue :
Whenever I access a webpage of a specific programming language and open three or more webpages before navigating back and then navigate back, the CSS styling of the last-clicked page persists, overriding other page styles.

## Steps to Reproduce:

1. Access the website and go to the desired programming language.
2. Open two or more webpages from the website.
3. Navigate back to the previously visited pages.
4. Observe that the CSS styling of the last-clicked page remains persistent.
5. Reload the page, and it redirects to the "Introduction" page.

## Expected Behavior:
CSS styles should reset when navigating back to a previously visited page.

# Example :

As you can see, I opened topics lilke Introduction -> Abstract Keyword -> Final Keyword
And when i navigate back to the "Abstract Keyword" topic, then the button/link for "Final Keyword" is still clicked.