How to adjust left margin for a single page on desktop only

Site URL: http://www.conorclinch.com/shop

Hi,

I've launched a shop on my website (www.conorclinch.com/shop) and I'm trying to adjust the left margin on the page on desktop ONLY. The mobile site looks perfect but the product elements aren't in the centre on the desktop version.

I've tried to below CSS code however it also alters the mobile device. 

Quote

 #collection-5e8216d7d6fbed74371df1c6 #page {
   margin-left: 100px;
   padding: 0px 0px;
}

Please can someone help me adjust this code so that it works on desktop only?

Thanks

Conor

@media screen and (min-width:641px) {
#collection-5e8216d7d6fbed74371df1c6 #page {
   margin-left: 100px;
   padding: 0px 0px;
}
}

Thank you so much!

It works for mobile/desktop now (they both look great) but the iPad still looks a little odd. I've tried playing around with the min-width but not sure what the min for iPad is. Could you help with this?

See attached how the iPad layout is looking. 

Don't worry - I fixed it. I put the min-width to 800px and it seems to have worked. Thanks!

try 901px