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<!DOCTYPE html> <html> <head> <style> html, body { height: 100%; } img.one { height: auto; width: auto; } img.two { height: 50%; width: 50%; } </style> </head> <body> <h2>Set height and width in %:</h2> <p>Original image:</p> <img class="one" src="ocean.jpg" width="300" height="300"><br> <p>Sized image (in %):</p> <img class="two" src="ocean.jpg" width="300" height="300"> </body> </html>