#calculator
{
	width: 250px;
	height: 350px;
	border: 5px solid black;
	text-align: center;
	background: DodgerBlue ;
	margin:150px auto;
	box-shadow: 0px 0px 1000px gray;
}



#display
{
	margin-top: 30px;
	margin-bottom: 20px;
	width: 220px;
	height: 30px;
	border: 1px solid red;'
	box-shadow: 0px 0px 30px red;
	text-align: right;
	font: 20px bold;
	color: blue;
}



#keys
{
	width: 41px;
	height: 35px;
	margin-left: 10px;
	margin-bottom: 20px;
	box-shadow: 0px 0px 20px skyblue;
	cursor: pointer;
}

#keys:hover
{
	background: yellow;
	font-weight: bold;
}

#equal
{
	width: 90px;
	height: 35px;
	margin-left: 10px;
	margin-bottom: 50px;
	box-shadow: 0px 0px 20px skyblue;
	cursor:pointer; 
}


#equal:hover
{
	background: yellow;
	font-weight: bold;
}