Why is it that when I click on any elements in the mobile version, they are dimmed?

Question

css

Good morning!
A site on Bitrix and on a mobile phone has 2 moments that prevent you from using the site normally on phones.
1. When you click on the elements, they are darkened;
2. When I call the menu, I click on the burger and the menu itself appears only after 1-1.5 seconds, all subsequent clicks call up the menu instantly;

Attach a video as an example https://radikal.ru/video/C0SCl75zskH
Site: https://gippokrat.ru/

Answer 1

take away

html {
  -webkit-tap-highlight-color: #000000;
}

Answer 2

Bitrix has nothing to do with it, look at the layout itself, why it is "stupid". As for the black areas when pressed, it's hardly layout, rather a browser. Check on a real mobile device and another browser, then it will already be possible to draw conclusions where the problem is