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<!DOCTYPE HTML> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <style> .btn1, .btn2 { border: 5px solid green; background-color: blue; } .btn1 { min-height: 50px; } .btn2 { height: 50px; } </style> </head> <body> <input type='submit' class='btn1' value='' /> <input type='submit' class='btn2' value='' /> </body> </html>