Use HTML$,$ CSS$,$ and JavaScript, as appropriate, to implement the following web$-$based application that should be optimized for mobile platforms, too.

We want to have an HTML form that acts as a simple calculator. There should be two textboxes for specifying the first and the second operands. Moreover, there should be a dropdown box for choosing one of the four arithmetic operators: addition, subtraction, multiplication, and division. Please check for division by zero and give feedback before this occurs $($prevent it$).$