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<!DOCTYPE html> <html> <head> <style> .div1 { width: 300px; height: 100px; border: 1px solid blue; } .div2 { width: 300px; height: 100px; padding: 50px; border: 1px solid red; } .div3 { width: 300px; height: 100px; border: 1px solid blue; box-sizing: border-box; } .div4 { width: 300px; height: 100px; padding: 50px; border: 1px solid red; box-sizing: border-box; } </style> </head> <body> <h2>Without box-sizing</h2> <div class="div1">This div is smaller (width is 300px and height is 100px).</div> <br> <div class="div2">This div is bigger (width is also 300px and height is 100px).</div> <h2>With box-sizing</h2> <div class="div3">Both divs are the same size now!</div> <br> <div class="div4">Hooray!</div> </body> </html>