You can adjust the menus by editing the style.css file.
#1 – Yes, you can do this by editing the style.css file.
#2 – We did not create any templates for tags, however, here is the documentation on how to create them if you decide to do it yourself https://codex.wordpress.org/Tag_Templates
Please note that we do not offer customization services since we focus mainly on building themes. What you are asking for is mostly customization and not bug fixing or reporting. However, we are more than happy to point you in the right direction.
I hope this helps.