What are the problems with HTML CSS on iOS?

Question

css

Actually 2 questions:
1) Why do inputs on iOS have an inner shadow and how to deal with it?
2) Why on iOS, regardless of styles, draws a "different" button?
Everything is in the attached images.

Answer 1

input, button { 
  -webkit-appearance: none;
  -moz-appearance:    none;
  appearance:         none;
}

Answer 2

Add this to the css of the button-webkit-appearance: none;

Answer 3

lnked, gogolinsky, thanks)