body{
	width:33%;
}

#res{
	background-color:lightgray;
	height:48px;
	font-size:20px;
	border:solid;
}

#btns button{
	width:25%;
	height:36px;
	font-size:18px;
	margin:0;
	float:left;
}

#btn0, #btn1{
	background:lightgreen;
	color:brown;
}

#btnClr, #btnEql{
	background-color:darkgreen;
	color:white;
}

#btnSum, #btnSub, #btnMul, #btnDiv{
	background-color:black;
	color:red;
}