Added background color to Navbar

[Shalini22-ui]

I have added background color to navbar for proper view and to enhance the site's overall design and user experience.

Please merge this request.
Solved issue #200

[greptile-apps]

Greptile Summary

This PR addresses issue #200 by changing the navbar background color from white (#ffffff) to a semi-transparent blue (#2564eba0). The change aims to enhance the site's visual design and improve user experience by making the navigation bar more prominent while maintaining some transparency.

The modification affects the main CSS file (styles/main.css) where a new navbar rule is added at line 677 that overrides the existing white background rule at line 19. The chosen color (#2564eba0) aligns with the site's existing blue theme color (#2563eb) used throughout the application for buttons, links, and branding elements. The alpha value (a0 = ~63% opacity) creates a modern semi-transparent effect that fits with contemporary web design trends.

This change impacts a core UI component that appears across all pages of the CodeClip application, including the main landing page, editor, challenges, profile, and about pages. The navbar is positioned as fixed-top, so this background color will be visible consistently as users navigate through the application.

Confidence score: 3/5

• This PR has moderate risk due to duplicate CSS rules and potential readability concerns with semi-transparent backgrounds
• The score reflects CSS rule duplication and lack of cross-theme testing, though the visual change itself is straightforward
• styles/main.css needs attention for the duplicate navbar background-color rules that should be consolidated

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[greptile-apps]

style: This creates a duplicate navbar rule. Remove the original white background on lines 18-21 to avoid CSS conflicts.

[Shalini22-ui]

@adityai0 please merge this request