How to allow for manual HTML & CSS changes? I'm using CK Editor to insert a table into my content (Body field).

I would like to set a background color, so I extended the style="width:100%" to be style="background-color: #FFEEE4; color: black;width: 100%". And this by clicking on Switch to plain text editor.

But now, once I save, the background-color style disappears again (Test Format FULL HTML). How can I make it stick?
go to:
/admin/config/content/ckeditor/edit/Advanced (for Filter HTML)
/admin/config/content/ckeditor/edit/Full (for Full HTML)
Then under Advanced Content Filter, select disabled.

If the above does not do it, depending on which one you are using (filter or full html) You need to go to
/admin/config/content/formats/filtered_html
OR
/admin/config/content/formats/full_html
Uncheck the correct faulty and chopped off html box.