body,html{ height: 100%}
.top{ display: none}
.main_nav_cont {
  width: 100%;
  margin: 0 auto; }

.main_nav {
  top: -130%;
  background: #3f3992;
  -webkit-box-shadow: 0 2px 2px 0 rgba(152, 152, 152, 0.75);
          box-shadow: 0 2px 2px 0 rgba(152, 152, 152, 0.75);
  position: relative;
  z-index: 9; 
  width: 100%; height: 100%;position: fixed;
  z-index: 999;

}
.show{ display: block;top:60px;}

.main_nav .fl{ float: none}
  .main_nav_cont ul {
   }
  .main_nav_home {}
  .main_nav_item {
    width: 126px;
    padding: 4px 0;
    text-align: center;
    position: relative; }
     .active.icon::after {
  transform:rotate(180deg);
-ms-transform:rotate(180deg); /* Internet Explorer */
-moz-transform:rotate(180deg); /* Firefox */
-webkit-transform:rotate(180deg); /* Safari 鍜� Chrome */
-o-transform:rotate(180deg); /* Opera */

}
.main_nav{
          -webkit-transition: .5s all ease;
  -o-transition: .5s all ease;
  -moz-transition: .5s all ease;
  transition: .5s all ease;
}
    .main_nav_item.icon::after {
        -webkit-transition: .5s all ease;
  -o-transition: .5s all ease;
  -moz-transition: .5s all ease;
  transition: .5s all ease;

      content: '';
      width: 10px;
      height: 6px;
      position: absolute;
      right: 4px;
      top: 27px;
      margin-top: -3px;
      background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAGBAMAAAAI3hL1AAAAMFBMVEUAAAD///////////////////////////////////////////////////////////87TQQwAAAAD3RSTlMAFA+ckWTXwK+ojH4gGQm9gmZWAAAAKklEQVQI12NYxMDAwMpwXoGBYQoD4ycGZgMGBvkHLUBBxvQNDEBwlYEBAHrrBsGSacSPAAAAAElFTkSuQmCC); }
    .main_nav_item a {
      display: inline-block;
      line-height: 42px;
      font-size: 18px;
      color: #fff; }
      .main_nav_item a:hover {
        color: #cd4047; }
  .main_nav_item_children {
    left: 0;
    top: 100%;
    width: 100%;
    background: rgba(63, 57, 146, 0.93);
    padding-bottom: 12px;
    padding-top: 8px;
    display: none; }
    .main_nav_item_children li {
      padding: 0; }
    .main_nav_item_children a {
      height: 28px;
      line-height: 28px;
      font-size: 16px; }