How can i add, edit or delete the Codes in SharePoint Online? [closed]

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I have a question abaut Sharepoint online, I want to creat a modern Website in SharePoint online but the Template for Design is limited. I want to Edit,delete or add my Website's codes in Sharepoint Online. Can somebody tell me, How can i do that ?

Answer 1

Custom master pages directly is not supported in modern pages currently. You could inject custom CSS on SharePoint modern pages by using SPFx extensions.

Here're some references for you:

Inject Custom CSS on SharePoint Modern Pages By Using SPFx Extensions

UPDATE: Inject Custom CSS on SharePoint Modern Pages By Using SPFx Application Extensions

There's a modern script editor web part you could utilize. Install it, add it to a page then you could add CSS styling through tags.