.calculadora { 
	border: 3px ridge blue; 
	width: 200px;
	text-align: center;
	background-color: #a3b1f3; 
	padding: 10px;
}

#numero { 
	width: 175px; 
	border: 2px black solid; 
	text-align: right; 
    position: relative;
    padding: 0px 5px;
    background-color: white;
    font-family: "courier new"; 
	overflow: hidden;
}

.calculadora [type=button] { 
	width: 35px;
	padding: 0;  
}