ul,li,h1,h2,h3,h4,h5,h6,b,i{margin:0; padding:0; font-style:normal; font-weight:normal;}
body{
    padding:0;
    max-width:640px;
    margin:0 auto;
    list-style: none;
    font-family: "Arial","Microsoft YaHei";
}


.download img {
    width: 100%;
    display: block;
}

.wxtip {
    background: rgba(0, 0, 0, 0.5);
    text-align: center;
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
    display: none;
}

.wechattip-icon {
    width: 100%;
    height: 100%;
    background: url('../img/wechat/wechat_bg.png') no-repeat;
    background-size: 100% 100%;
    display: block;
}