I've been tasked with implementing a full-blown SharePoint website using SharePoint Online, but I am still quite new and I need some help.
The design team has sent us a layout completely different than what Sharepoint offers in its templates. We're also supposed to display files using categories, though we haven't found anything related to file category/hierarchy management in SharePoint Online's interface. What I'd like to do is to display the files myself (with my own HTML/CSS) in a SharePoint Online team site. I've been unable to find any documentation on how to do so using SharePoint online - the only documentation I seem to find is for SharePoint 2013.
Is there any documentation on how to do that ? Is it even possible to do such a thing with a team site on SharePoint Online ?