body {
    font-family:"微软雅黑";
    background: url(star_bg.png) center top no-repeat;
    background-size: 100%;
}
*{
    margin:0;
}
.header {
    color:#D8D8D8;
    font-size: 1.8rem;
    padding:1.6rem 0 0.4rem 2.4rem;
    text-align: center;
    overflow: hidden;
}
#header-lef{
    margin:0 0 0 0.3rem;
    color:whitesmoke;
    float:left;
    width:0;
}

ul{
    padding:0;
}
.content {
	position: fixed;
	top: 50%;
    margin-top: -223px;
    padding: 3% 0.5rem;
}


#bt{
    font-size:2.5rem;
    color:cadetblue;
    letter-spacing: 0.3rem;
}

#kh{
   font-size:1.5rem;
    color:#000;
}

#desc{
    /*padding:0 1rem;*/
    font-size:1.1rem;
    line-height:1.6rem;
    color:#999;
    /*letter-spacing:0.2rem;*/
    text-align: center;
}

.dl {
    float: left;
    width:50%;
}

li {
    list-style-type: none;
    margin-top: .7rem;
    text-align: center;

}
li>span{
    font-size:1.7rem;
    color:#404040;
}

li>img{
    width:4rem;
    margin-top:0.2rem;
}

li>button{
    margin-top: 0.2rem;
    width: 40%;
    background-color: #1a1a1a;
    border: none;
    color: whitesmoke;
    padding: 0.6rem 0rem;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 1rem;
    border-radius: 0.5rem;
}

.footer {
    padding:1rem 0;
    clear: both;
    text-align: center;
    color:#cdcdcd;
    font-size:0.9rem;
    position: fixed;
    bottom: 0;
    width: 100%;
}

.download{
    margin-top:18%;
    overflow: hidden;
}

button{
star : expression(onmouseover=this.style.cursor='hand'）
}