body{
	background-color:;
	margin:auto;
	padding-top: 70px;
	text-align: center;	
	font-size: 15px;
	color:white;
}

#container{
	background-color: black;
	width: 350px;
	height:500px;
	border-radius: 22px;
	width
}

.row1{
	margin-top: 20px;
	padding-top: 10px;
}

#screen{
	height:70px;
	font-size: 50px;
	text-align: right;
	border-style: solid 1px;
	color:white;
	
}


.btn-circle {
    width: 70px;
    height: 70px;
    padding: 6px 0px;
    margin: 5px 0px 5px 5px;
    border-radius: 50%;
    text-align: center;
    font-size: 30px;
}

.btn-circle1 {
    width: 155px;
    height: 70px;
    padding: 6px 0px;
    margin: 5px 0px 5px 5px;
    border-radius: 30px;
    text-align: center;
    font-size: 30px;
}

#nav{
	margin-top:0px;
	padding-top: 5px;
	font-size: 30px;
	font-color:black;
}