Custom banner image size for mobile and desktop

[dngmanblack]

Hi guys! I create custom CSS code for what I'm looking for in my online store. But I need to figure out how to find the exact code for both mobile and desktop. There's always the conflict between mobile and desktop versions. So looking for some help from you guys. 

Here's my store: www.siulux.com

PW: @Siulux19

Many thanks for your help.

[Mehran_Ali]

Hi @dngmanblack 

I will help in that if you can share the code you created 

you use the media Query to implement the CSS in desired screen size 

https://www.w3schools.com/css/css_rwd_mediaqueries.asp