Hello Gil,
Thank you for reaching out to Microsoft Community. I am happy to help you today!
To ensure we're aligned and I can provide you with better support, could you share a bit more information? Your details will help me assist you more effectively
- What type of content are you trying to style? (Is it a list or document library or a web part on a page?)
- Do you want to style the entire page or just a specific view (like a column or row)?
- Are you using a Modern or Classic SharePoint site? SharePoint classic and modern experiences
You can send me a screenshot so I can understand your needs better for further assistance.
Besides, I have found an article related to your query. You can take a look and see if it helps with your problem.
Change the look of your SharePoint site (Customize the theme, header, logo, navigation,...)
Color palettes and fonts in SharePoint (only available for classic SharePoint experiences)
Branding your SharePoint site (Technical guidance for developers and admins on applying custom themes, logos, and CSS)
If you think my information is helpful to you, it will mean a lot if you could mark it as the answer and vote up. This helps highlight the response at the top, making it easier for others in the community to quickly find the information they need.
Thank you for your understand and cooperation during the process. We are always eager to hear from you soon!
Best Regards,
Alina-Le MSFT | Microsoft Community Support Specialist