body {
	background: snow; 	
	font-size: 24px; 
}
h1, h2, h3 {
	text-align: center; 
	color: blue; 	
}	
h4 {
	color: blue; 	
}	
.disp-flex {
	display: flex; 	
}
.block {
	margin: 5px; 
	padding: 50px; 
	margin-right: 10%; 
	margin-left: 10%; 
	border: 5px gray solid; 
	border-radius: 10px; 	
}