WordPress site appears different on different browsers

Hi,
I have searched other posts for a solution but everyone’s problem seems to be different. So im starting my own post.

my website is http://www.paulamiradaki.com.au

I am having a problem with my website appearing slightly different in different browsers. If you go to my site in firefox it will appear normal. However if you open it in chrome, safari, mobile, etc you will notice the text and phone number are out of place… also the boxes for the contact details in the side widget is out of place.

Can anyone give me a solution to this problem?

Your help would be much appreciated.

Thanks!