{
	padding: 0;
	margin: 0;
	box-sizzing: border-box;
	font-family: century
}	
 
body {
      background: linear-gradient(to bottom, #3498db 0%, #3498db 50%, white 50%);
      margin: 0;
      padding: 0;
    }
header{
	background: url("https://s1.1zoom.me/big0/194/Sweets_Chocolate_Grain_505259.jpg");
	height: 100vh;
	background-size: cover;
	background-position:center
}

ul{
	list-style: none;
	float:right;
	display:flex;
	margin-top:20px;
}
ul li a {
	text-decoration:none;
	color:rgb(255,255,255);
	padding:10px 20px;
	text-transform:uppercase;
	border: 2px solid;
	margin:10px;
	font-weight:500;
	transition:0.6s ease;
}

ul li a:hover{
	background:rgb(255,255,255);
	color:rgb(0,0,0);
}

ul li.active a{
	background:rgb(255,255,255);
	color:rgb(0,0,0);
}

.principale{
	max-width:114rem;
	margin:0 auto;
}
.titre{
	position:absolute;
	top:50%;
	left:50%;
	transform: translate(-50%,-50%);
}
.titre h1{
	color:rgb(255,255,255);
	font-size:70px;
}