html{
    font-size: 100%;    
}

body
{
	font-size: 120%;    
	text-align:center;
}

h1
{
	font-size: 100%;
}

h2
{
	font-size: 80%;
}


ul
{	
	font-size:160%;
}

nav {display:table; width:100%; background:#dadada}
nav ul {display:table-row; }
nav li {display:table-cell; border:1px solid #000000; text-align:center;}

.calcScreen
{
	font-size:200%;
	margin-top:50px;
	border:1px solid #000000;
	width:97%;
}

.calcButton
{
	border:1px solid #000000;
	height:115px; 
	width:115px;
	font-size:180%;
	margin-top:10px;
}

.calcOperators
{
	background:#efefef;
}

.calcNumbers
{
	background:#cdcdcd;
}