Why is the button on the site not being pressed from the phone?

Question

Mobile development

Hello!
Problem:
There is a site http://excursion.moskva. The site has buttons "Book a tour", which for some reason are not pressed from the phone (I'm trying to do it through Safari on Iphone 5s). Everything works from the computer - after clicking on the button, a date and time selection form appears, which does not happen when working from the phone.
I would like to thank everyone in advance who will help.
UPD:
I downloaded Yandex.Browser to my phone. There the form appears, but not in other browsers.

Answer 1

You most likely in the mobile version of the button overlaps another element with a transparent background.