*{
	margin:0;padding: 0;
	box-sizing: border-box;
}
ul,li{
	list-style: none;
}
a{
	text-decoration: none;
	color: #000;
}
body,html{
    width: 100%
}
.banner-img{
	width: 100%
}
.download{
	width: 1200px;
}
.content{
	width: 100%;
	text-align: center;
}
html {
    min-width: 1200px;
    min-height: 600px;
}
.content-img{
	margin: 80px 0
}
/*nav*/
.download-nav{
    width:650px;
    position: absolute;
    left:50%;
    top:40px;
    margin-left: -100px;
    height: 20px;
}
.download-nav li{
    width:82px;
    float: left;
}
.download-nav li a{
    font-size: 15px;
    color: #434343
}
.download-nav li a:hover{
    color:#13b1cd
}
.clearfix {
  display: block;
  content: '';
  clear: both;
}
.mr{
    margin-right: 10px
}