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What width are we writing for mobile first?

So basically, we are told to use mobile first approach then use media queries for higher widths however we aren't told what is the first width to write our code in. When we do mobile first in CSS we do not write a media query to show what width it is we just write for 'mobile' so what does that 'mobile' mean in width wise?

Marco Caruso
Marco Caruso
5,208 Points

480px is the average width of display for mobile devices.