I delete all the content in columns and insert a background picture:
But the picture is only shown like this:
And I want it to be shown in full size.
So I tried to put the code in the above given by the support or whoever it is in the theme‘s CSS (I don’t know if this is the right place. Looks like not.)
I don’t know how to customize HTML. If I have the banner image URL, how can I make it a banner?