I have done a program which looks differently in different devices. what should I do to look my program equally in all devices ?

Question

Should I change the CSS.
Every time when I do program I did'nt notice this thing and when I saw this result in my second phone I saw that the elements are toally in wrong position.

Answer 1

You can you media queries to sort out this problem.
It will help
https://www.w3schools.com/css/css3_mediaqueries.asp

Answer 2

You should use % instead of fixed pixels and also read about flex-box and grid