Fixed footer on bottom of the screen if page doesn’t have enough content

Hi, I read and tried almost everything what I found on the internet but I still don’t fix problem with footer on bootom if page doesn’t have enough content.
I’m using Elementor PRO with Hello theme.
Can someone help me?
And yes I know that web page looks very old with ugly colours , but I don’t know how to explain this to my client ??
Thanks for help
Screenshoot

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