i do not have any detail
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shasan
You can change the SharePoint colors by following instructions:
On your site, click Settings
and then click Change the look > Theme.
Note: If you don’t see Change the look on the Settings menu, you may not have permission to manage this option. Select the look you want. You’ll see a preview of what your site looks like with the selected theme applied. Click Save to apply it to your site or, if you don’t like what you see and want to revert back to what you had in the beginning, click Cancel instead.
Notes:
Choose the main color and accent color you want, and then click Save to apply it to your site. The list of main colors and accent colors varies depending on the default SharePoint theme you choose to customize.
Stevie
Mujeeb please click the link mentioned below,
Each and everything is mentioned in detail.
Change background
https://support.microsoft.com/en-us/office/change-the-look-of-your-sharepoint-site-06bbadc3-6b04-4a60-9d14-894f6a170818
Ch Kashif
Change the Wallpaper on SharePoint:
Ch Kashif
Use the new site design