@media screen and (max-width: 800px) {
  .bottom_fixed {
    display: none;
    position: fixed;
    bottom: 0px;
    width: 100%;
    z-index: 9999999;
  }
  .bottom_fixed div {
    width: 30px;
    height: 30px;
    text-align: center;
    line-height: 30px;
    background: #CCC;
    right: 0;
    top: -30px;
    position: absolute;
    cursor: pointer;
  }
  .bottom_fixed div:hover {
    background: #F66;
    color: #FFF
  }
  .bottom_fixed a img {
    height: 75px;
    width: 100%;
  }
  .lb_ad, .rb_ad, #show_ad {
    display: none;
  }
}
@media screen and (min-width: 800px) {
  .bottom_fixed {
    display: none;
    position: fixed;
    bottom: 0px;
    left: 50%;
    margin-left: -475px;
    z-index: 9999;
  }
  .bottom_fixed div {
    width: 24px;
    height: 24px;
    text-align: center;
    line-height: 24px;
    background: #CCC;
    right: 0;
    top: -24px;
    position: absolute;
    cursor: pointer
  }
  .bottom_fixed div:hover {
    background: #F66;
    color: #FFF
  }
  .bottom_fixed a img {
    height: 75px;
    width: 950px;
  }
  #show_ad {
    cursor: pointer;
    position: fixed;
    width: 44px;
    height: 44px;
    line-height: 44px;
    color: #4bb9f8;
    text-align: center;
    right: 0;
    top: 0;
    background: #1a90d4;
    border-left: 1px solid #4bb9f8;
    z-index: 9999;
  }
  #show_ad:hover {
    color: #FFF;
  }
  .show_adbg {
    background: #F90 !important;
    color: #FFF !important;
  }
  .adbg {
    background: #333 !important;
  }
  .adbg, .adbg div, .adbg span {
    color: #FFF !important;
  }
  .lb_ad, .rb_ad {
    display: none
  }
  .lb_ad, .rb_ad {
    width: 190px;
    height: 214px;
    position: fixed;
  }
  .lb_ad {
    left: 0px;
    bottom: 0
  }
  .rb_ad {
    right: 0px;
    bottom: 0
  }
  .b_close {
    width: 190px;
    height: 24px;
  }
  .b_close a {
    display: block;
    width: 24px;
    height: 24px;
    line-height: 24px;
    background: #FFF;
    float: right;
    text-align: center;
  }
  .b_close a:hover {
    background: #F66;
    color: #FFF
  }
  .lb_ad .b_close a:active .lb_ad {
    display: none
  }
  .adimg, .adimg img {
    height: 190px;
    width: 190px;
  }
}