How to customize Share Point list column headers background colour ?

I would like to especially change backround colour of the column header. 

Can you suggest any blog or video which will be helpfull to use SPFx.

Hi The_8 

you can use ViewFormatting to change the look from your view, but not from the header column, this is not possible with JSON. Here are more detail about ViewFormatting: 

https://learn.microsoft.com/sharepoint/dev/declarative-customization/view-list-formatting?WT.mc_id=DX-MVP-5004845

Other way you can try is to develop a SPFx solution, but you ned more deep know-how about dev in SharePoint online.

Regards, Dave