*{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;
}
body{
	background: url(../img/bg3.jpg);
	background-size: 100%;
}
header h1{
	text-align: center;
	line-height: 40px;
	margin: 20px auto;
	letter-spacing: 10px;
}
footer{
	width: 85%；
	margin: 20px auto;
}
footer ul{
	width: 80%;
	margin: 0px auto;
	margin-bottom: 40px;
	display: flex;
	justify-content: space-around;
}
footer ul li{
	width: 15%;
	background-color: rgba(0,0,0,0.2);
	border-radius: 5px;
	border: 1px solid olive;
	line-height: 40px;
	text-align: center;
}
footer ul li a{
	color: #000;
	letter-spacing: 20px;
	display: block;
}
footer ul li a:hover{
	background-color: rgba(0,0,0,0.3);
	color: snow;
}