header{
    padding: 15px;
    background-color: #166a8b;
    color: white;
    margin-bottom: 30px;
    text-align: center;
}

footer {
    font-size: 1.2rem;
    text-align: center;
    background-color: silver;
    border-top: 1px solid grey;
    padding-bottom: 2cm;
}

main{
    text-align: center;
}

button{
    overflow: hidden;
}

.item {
    overflow:hidden;
    border-radius:200px;
    width:200px;
    height:150px;
    border-width: 2px;
    border-color: black;
    border-style:solid;
    display: inline-block;

}

.container{
    margin: 3px;
    border-color: black;
    border-style:solid;
    width:390px;
    height:300px;
    text-align: center;
    display: inline-block;

}

.bouton-refresh {
	box-shadow: 0px 10px 14px -7px #276873;
	background:linear-gradient(to bottom, #599bb3 5%, #408c99 100%);
	background-color:#599bb3;
	border-radius:8px;
	display:inline-block;
	cursor:pointer;
	color:#ffffff;
	font-family:Arial;
	font-size:20px;
	font-weight:bold;
	padding:13px 32px;
	text-decoration:none;
	text-shadow:0px 1px 0px #3d768a;
}
.bouton-refresh:hover {
	background:linear-gradient(to bottom, #408c99 5%, #599bb3 100%);
	background-color:#408c99;
}
.bouton-refresh:active {
	position:relative;
	top:1px;
}