*{box-sizing: border-box;}
p,h1,h2,h3,h4,h5,h6,ul,ol,dl,li,form,table,a,div,img,body{
	margin:0;
	padding:0;
}
ul{
	list-style: none;
}
a{
	text-decoration: none;
}
.clearfix:before,.clearfix:after{display: block; content: ""}
.clearfix:after{clear:both;}
li{
	list-style: none;
}
header{
	width: 80%;
	margin: 40px auto;
	position: relative;
}
header h1 a{
	color: yellow;
	letter-spacing: 10px;
	font-size: 40px;
}
header ul{
	width: 900px;
	margin-left: 250px;
	display: flex;
	justify-content: space-around;
}
header ul li{
	width: 10.8%;
}
header ul li a{
	background-color: rgba(0,0,0,0.2);
	display: block;
	line-height: 40px;
	text-align: center;
	color: lightgoldenrodyellow;;
	border-radius: 5px;
	border: 1px solid olive;
}
header ul li a:hover{
	background-color: rgba(0,0,0,0.5);
}