How to make layout for mobile phones at 750px?

Question

css

Hello!
Tell me how to make layouts for mobile phones at 750px?
Previously, I was given layouts for desktop, tablets (768px) and mobile phones (320px). And then something new is straight forward and the designer says that now I do everything like that, but how does everyone now typeset like that? :)

Answer 1

learn how to layout adaptively,
separately mobile, desktop, and so on - yesterday. you never know what will be invented tomorrow

Answer 2

750 is an iPhone 6-8 or what?
They have a width of 750 taking into account the retina, and in css pixels - 375.