Question Impossible to center search bar in header

[Cptech]

Hello,

I have been trying to do a simple thing with Elementor for weeks now but I cannot figure out how.
In the Elementor Header I have a searchbar, which I would to be centered.
website in compare-tech FR

I have tried setting the elementor box with Horizontal align = center
but it does not work.

Then I tried with css but nothing I usually use works. Like margin auto or align-content.

Does anyone has an idea where I can fix that on Elementor or even why the css does not work ? Even with !important

Thank you for anyone who can help !