logo{
	border:1px solid green
}
nav{
	text-align: center;
	width: 98%;	
	position:fixed;top:4em;left:1%;
}
main{
	position: fixed; top: 5.5em; 
	height: calc(100% - 260px);	
	width: 99%;	
	overflow-y: auto;
	overflow-x: hidden;
}

footer{
	width: 99%;
	background-color: #CCC;
}
bottom{
	display:flex; 
	width:100%; 
	justify-content:center; 
	align-items:center;
	flex-direction: row;
}
#bot_nav{
	width:100%;
	margin:5px;    
	font-size: 14px; 
	font-weight:bold;
}

container1{
	width: 25%;	min-width: 220px; max-width: 400px;
}
container2{
	width: 25%;	min-width: 160px; max-width: 400px;
}