Hello,

I saw the screenshot you attached.

It seems that the CSS you are trying to use has a syntax error that’s why it’s not working.

Screenshot for Clarification: https://ibb.co/V3cJPsF

Please remove the comma from the CSS and check back.

If you are still unable to change the size then provide with the URL of the website to check it myself and help you out accordingly.

Best Regards.