I would like to work on this issue, if this project is active please assign this task to me.

Hi @VartikaS12, please see https://www.mediawiki.org/wiki/New_Developers#Communication about assigning - thanks.
This is on-wiki content to edit and seems to require some permissions.

@DAlangi_WMF or @DNdubane_WMF : Who can fix this? Or how can I fix this myself as editing these pages is restricted for reasons not known to me?

@VartikaS12, you can edit the page now. Restrictions has been lowered on editing. Thanks a lot for your interest and do let me know if you need anything else to progress on this issue. :)

@Aklapper, it was done so because since the project was still in active development late last year, things were being changed constantly. Now that the interface is a bit stable, the restriction has been dropped on editing. Thank you!

This should use a CSS flex design, but after an hour staring at the code I'm still puzzled. Seems to also inconsistently uses {{Clickable button 2}} vs custom CSS whenever a button is not a direct link but needs a specific class. Also abuses <br> for vertical layout. Plus T284380: Make boxes have consistent height.