* {
	margin:0;
	padding:0;
}
header
{
	width:100%;
	background:rgb(255, 153, 0);
}

li a
{	
	padding:20px;
	display:block;
	text-decoration:none;
	color:#FFFFFF;
	font-size:24px;
	font-family:Arial, Helvetica, sans-serif;
}

li a:hover
{
	color:#666666;
}

nav {
	width:90%;
	max-width:1000px;
	margin:20px auto;
}

ul {
	overflow:hidden;
	list-style:none;
}
 
li {
	float:left;
}

span{
	margin-right:10px;
}

.menu_bar {
	display:none;
}

.menu_bar a{
	color:#fff;
	padding:20px;
	display:block;
	text-decoration:none;
	font-family:Arial, Helvetica, sans-serif;
}

@media all and (min-width: 350px) and (max-width: 900px) {	


	header{
		position: fixed;
		width: 95%;
		margin-left: 11px;
	}
	nav {
		width:70%;
		height:100%;
		left:-100%;
		margin:0;
		position: fixed;
		background:rgb(255, 153, 0);
		text-align: left;
	}
 
	li {
		display:block;
		float:none;
		border-bottom:1px solid rgba(255,255,255, .3);

	}
	 
	.menu_bar {
		display:block;		
		width: 100%;
		background:rgb(255, 125, 0);

	}
 
	.menu_bar .bt-menu {
		display:block;
		padding:20px;
		color:#fff;
		text-decoration:none;
		font-weight: bold;
		font-size:25px;
		-webkit-box-sizing:border-box;
		-moz-box-sizing:border-box;
		box-sizing:border-box;
	}
 
	.menu_bar span {
		float:right;
		font-size:40px;
	}
}