on this page we can't see the download action buttons:
https://alephinf.it/download/service-pack?category[0]=67&category_children=1
Contacting the download module provider gives us this explanation:
Thank you Francesco.
The problem here is the template you are using. For buttons we use styles that are defined on Joomla core templates, and this from Joomla 3 up to Joomla 5. This is done so that the colors of buttons match the template color scheme. 3rd party templates always make sure to include these styles, your template does not.
Please check for example the template.css file of core templates and look for CSS styles starting with btn- ... your template is not defining any of those.
My recommendation is to copy a those from template.css and then add it on yours, after this you just adjust the colors. This should work out just fine.
I hope this helps.
