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<!DOCTYPE html> <html> <head> <style> #example1 { border: 2px solid black; padding: 25px; background: url(/demo/images/mountain.jpg); background-repeat: no-repeat; background-size: 100% 100%; } #example2 { border: 2px solid black; padding: 25px; background: url(/demo/images/mountain.jpg); background-repeat: no-repeat; background-size: 75% 50%; } </style> </head> <body> <h2>background-size: 100% 100%:</h2> <div id="example1"> <h2>Hello World</h2> <p>The size of the background image is set in percent of the parent element; 100% width and 100% height.</p> </div> <h2>background-size: 75% 50%:</h2> <div id="example2"> <h2>Hello World</h2> <p>The size of the background image is set in percent of the parent element; 75% width and 50% height.</p> </div> </body> </html>