h1 {
	font-family: sans-serif;
	padding: 10px;
	color: yellow;
}

input {
	font-size: 24px;
}

.main {
	border: blue solid thick;
	padding: 10px;
	width: 520px;
	background-color: #6666ff;
}

.display {
	font-family:  Courier, monospace;
	font-size: 32px;
	border: black solid thin;
	padding: 10px;
	margin: 10px;
	width: 340px;
	background-color: #ffffcc;
}

.key_block {
	padding: 10px;
}