CSS code for a responsive image or box

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1

I’m trying to make an image or container box responsive so that the image enlarges and adapts to the large desktop screen.

Product:
Wix Editor

What are you trying to achieve:
I’m looking for a CSS code to create a responsive image or containerbox?

What have you already tried:
Various codes from the internet

Additional information:

2

You can’t do it on the ordinary Wix-Editor.
You will have to upgrade to Wix-Studio.

Also direct CSS-coding is possible on Wix-Studio only.