Move sidebar right and make smaller and increase main content width

Hi - my sidebar is too far to the left on the page and too wide - is there custom css to move the sidebar to the right and make it smaller width, and as well increase the width of the main content section? I have searched and cannot find this topic.

Thank you

Hello there,

I hope you are doing well today.

Could you please provide a link to your website so that I can inspect it?

Best Regards,