Sticky side button or pop up or..

Hello everyone,
I’m looking for a plugin or others that allows me to put my booking module of my hotel. Here are examples => image => https://marseille.intercontinental.com/
or

=> https://www.lepatiodesartistes.fr/fr/
as a full-page popup or side stick. I have to put html / css inside provided by Best Western.
I use the AVADA theme.
Do you know a plugin that does this? Thank you in advance for your answers.
Ben