Second Index

Hi guys, I’ve gone through the steps here >
https://wordpress.org/support/topic/creating-a-second-index-page?replies=16

to create a second index.php for specific categories.
within this process the formatting disappeared and though the correct posts come through to the new page with the index-2 template the styling is gone.

is this a css related issue? can someone point me in the right direction.
i copied the original index file to make index-2.