Transforming text links in sidebar into buttons

Hi,

I want to make the menus on my sidebar buttons instead of plain text links, https://informationmarketingexpert.com/test/

Preferable “FREE Training” would be a button …
then the items under it will be submenu buttons (not dropdown)…
any plugins to do this? (Don’t provide me any long css details, unless it’s simple I won’t follow ??

I refer to these as the items:

Info-Marketing
Email Strategies
Website Conversion

Thanks
Jack