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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> /* For width smaller than 400px: */ body { background-repeat: no-repeat; background-image: url('img_smallflower.jpg'); } /* For width 400px and larger: */ @media only screen and (min-width: 400px) { body { background-image: url('img_flowers.jpg'); } } </style> </head> <body> <p style="margin-top:360px;">Resize the browser width and the background image will change at 400px.</p> </body> </html>