Position: sticky not working in Safari?

Question

css

On the website at the bottom of the screen, you need to stick a strip with the application form.
The form should always be at the bottom until you scroll to this block (the application form block is located after the content, but before the footer).
It was decided to use

position: sticky,
bottom: 0px;

In Edge, FF, Chrome, Opera works as it should.
In IE 11 (no sticky support) and Safari (support available) it doesn't stick.
Also prescribed -webkit-sticky , also does not work.
And another question: is there a service for checking the site in Safari (desktop version)?
The code is this:
https://codepen.io/thebatik/pen/rroNRX

Answer 1

https://caniuse.com/#search=sticky

Answer 2

And another question: is there a service for checking the site in Safari (desktop version)?

https://www.browserstack.com/