#download_li{
    background: #ff9c01
}
#download_html{
    min-height: 540px;
    /*background-color: aliceblue;*/
    width: 1250px;
    margin: auto
}
#gtitle{
    border-bottom:2px solid green;
    font-weight:600;
    padding: 15px 30px;
    display: block;
    font-size: 1.2em;
    color: green;
}
.main_head{padding: 15px 30px;}
.nav_header{width: 300px;height: 40px;line-height: 40px;padding-left: 30px;border-top: 1px solid #E0E0E0; border-bottom: 1px solid #E0E0E0; /*border-bottom: 3px solid green;*/font-weight: 550;} 
#download_list li,#txt li{list-style:disc;margin-top: 5px;}
#list_ul,#txt{margin-left: 75px!important}
#tip{
font:600;
font-size:18px;
 margin:100px 400px; 
}
.notclick{
    pointer-events:none;
}
#txt{
    margin-bottom: 0px!important
}