body { 
	font-family: sans-serif; 
	padding: 2em; 
	background: #f5f5f5; 
}
.container { 
	background: #fff; 
	padding: 2em; 
	border-radius: 10px; 
	max-width: 800px; 
	margin: auto; 
}
textarea, pre { 
	width: 100%; 
	height: 200px; 
	margin-top: 1em; 
	font-family: monospace; 
}
button { 
	margin-top: 1em; 
	padding: 10px 20px; 
	font-size: 16px; 
}
.result {
	margin-top: 1em;
	font-weight: bold;
}