body{
	color: #303030;
}
section{
	width: 100%; 
}
article{
	background-color: #F0F0F0;
	padding: 100px 0;
	text-align: center;
}
article:nth-child(odd){
	background-color: white;
	border: .5px solid #F0F0F0;
}
.hidden{
		display: none;
}
nav{
	background-color: grey;
	color: white;
	width: 100%;
	height: 10%;
	position: fixed;
	top: 0;
	left: 0;
}
nav ol{
	list-style-type: none;
}
nav ol li{
	padding: 12px 20px;
	float: right;

}
nav ol li:first-child{
	padding: 0 0;
	float: left;
}