Confirmation messages hidden under the footer

Hello,
On my ‘contact’-page (made with plugin Contact Form 7 v5.6.3) the confirmation popup, when clicking the ‘send – verstuur’ button doesn’t show up. It is hidden by the footer of my RIFE Free theme… When I switch to another theme it is working properly.
How can I fix this? I really like the RIFE Free theme also and would like to keep it working on my site. Thanks!

The page I need help with: [log in to see the link]

 

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