Disable horizontal scrolling

I am using this shortcode:
[wp_colorbox_media url=”https://www.comefriusa.com/?page_id=364&content-only=1″ scrolling=”no” type=”iframe” width=”800px” hyperlink=”http://www.comefriusa.com/wp-content/uploads/2011/09/ANPA-150×150.png”%5D

However, the width attribute seems to be giving me no control over the lightbox width and scrolling. My client does not want horizontal scrolling enabled. Is there a way to disable horizontal scrolling?

Thank you!

https://wordpress.org/plugins/wp-colorbox/