body{
	margin:40px auto;
	max-width:650px;
	line-height:1.6;
	font-size:18px;
	font-family: helvetica, sans-serif;
	background-color:#DDD;	
	color:#444;
	padding:0 10px
}

h1,h2,h3{
	line-height:1.2
	}

.display{
  	width: 70%
}

@media (prefers-color-scheme: dark) {
	body {
	      background-color:#000;	
	      color:#FF7E00;
	}
	a {
		color: #E00;
	}
}