.main {
  width: 70%;
  background-color: #fff6;
  padding: 2% 5%;
  border-radius: 10px
}
ul {
  padding-left: 20px;
}
ul li {
  line-height: 2.3
}
a {
    color: #00c;
    text-decoration: none;
}
body {
  background-repeat:no-repeat;
  background-size:100%100%;
  background-attachment:fixed;
}
.srk {
    height: 16px;
    background-color: #fff9;
    border:1px solid #000;
}
.botton {
    background-color:#fff;
    border:1px solid #000;
    text-shadow:0px 1px 0px #fff;
    display:inline-block;
    cursor:pointer;
    color:#000;
    font-family:Arial;
    font-size:15px;
    padding:9px 16px;
    text-decoration:none;
    position:relative;
    top:1px;
}
.wjxz {
    border:3px solid #7779;
    height: 250px; 
    background-image: url('wjxz.png');
    background-repeat: no-repeat;
    background-size: 100%100%;
    background-attachment: scroll;
}
.file {
    width: 100%;
    height: 100%;
}
details[open] {
    border:3px solid #7779;
}
.progress-container {
    width: 100%;
    background-color: #f3f3f3;
    margin-top: 10px;
}
.progress-bar {
    width: 0%;
    height: 30px;
    background-color: #4CAF50;
    text-align: center;
    line-height: 30px;
    color: white;
}
.chunk-info {
    margin-top: 10px;
    font-family: monospace;
}
/* 电脑，手机横屏 */
@media screen and (orientation: landscape) {
body {
  background-image:url('bg.jpg');
}
.srk {
    width: 50%;
}
.wjxz {
    width: 70%;
}
.main {
  margin: 3% auto 0;
}}
/* 手机竖屏 */
@media screen and (orientation: portrait) {
body {
background-image:url('bg_m.jpg');
}
.srk {
    width: 90%;
}
.wjxz {
    width: 100%;
}
.main {
  margin: 8% auto 0;
}}