body {
	background: linear-gradient(to bottom, blue , cyan);
	/* background: #f5f5f5; */
}
.container {
	margin-top: 20px;
	font-family: 'Lora', serif;
	
	color: green;
}
.jumbotron {
	padding-top: 10px;
	background-color: silver;
}
.btn-danger {
	margin-top: 10px;
}
.secondes {
	margin-top : -20px;
}
#paris {
	transition: 0.25s;
	visibility: hidden;
	opacity: 0;
}