* { box-sizing: border-box; } body {margin: 0;}*{box-sizing:border-box;}body{margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;}*{box-sizing:border-box;}body{margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;}body{font-family:Arial, sans-serif;background-color:rgb(244, 244, 244);margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.container{text-align:center;margin-top:50px;}h1{color:rgb(51, 51, 51);}button{padding-top:10px;padding-right:20px;padding-bottom:10px;padding-left:20px;font-size:16px;cursor:pointer;border-top-width:initial;border-right-width:initial;border-bottom-width:initial;border-left-width:initial;border-top-style:none;border-right-style:none;border-bottom-style:none;border-left-style:none;border-top-color:initial;border-right-color:initial;border-bottom-color:initial;border-left-color:initial;border-image-source:initial;border-image-slice:initial;border-image-width:initial;border-image-outset:initial;border-image-repeat:initial;background-color:rgb(0, 123, 255);color:white;border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-right-radius:5px;border-bottom-left-radius:5px;}button:hover{background-color:rgb(0, 86, 179);}.hidden{display:none;}#message{margin-top:20px;font-size:18px;color:green;}