Website displays differently across differentcomputers

Site URL: http://www.jondeaneditor.com

Hi there,

I have a bio page that is located under my homepage image, on my laptop the pages are distinct but on my iMac the background image isn't displayed correctly and the bio page leaks into the homepage. See attached images for ref. Is there a way to make sure this is uniform across different computers?

I'm aware the resolutions on these 2 different machines are differ from oneanother but it would be good to have it displayed as it does on my laptop otherwise it's rather messy.

Thanks

Display changes due to browsers used and screen resolution. Sites change across different computers just like they change across different mobiles as well.