Code Area

User story

As a user, I want to have an area for writing code on the left half of the screen, with tabs for HTML, CSS, and JS. I also want the entered code to be remembered when switching between tabs.

Acceptance criteria

• The code area is displayed on the left half of the screen with purple background color.
• Each tab displays an initial placeholder code (e.g., "Add HTML code here" comment or some example code).
• Switching between tabs should be possible and retain the previously entered code.
• Tabs have appropriate hover, active, and highlight states.