I want to ask regarding the header banner images. How many do you usually need in a website when you want it as responsive? I know my question is confusing. Let me revise it if it's kind of hard to understand. I'm making a website and the maximum header image is 1900 x 375. That's the 1st header image. What is the next? How many do you usually make for responsive headers and what width resolutions are the best?