.bg {
  width: 982px;
  margin: 0 auto;
  overflow: hidden;
  box-sizing: border-box;
}

.bg_left {
  width: 500px;
  height: auto;
  float: left;
}

.bg_right {
  float: left;
}

.bg_left > .showimg {
  /*width: 500px;
  height: 400px;*/
  margin-bottom: 10px;
  position: relative;
  cursor: move;
}

.bg_left > .showimg img {
  width: 500px;
}

.mask {
  width: 270px;
  height: 260px;
  background: #000;
  filter: Alpha(opacity=50);
  opacity: 0.5;
  position: absolute;
  top: 0;
  left: 0;
  display: none;
}

.bigshow {
  width: 430px;
  /*height: 430px;*/
  height: 500px;
  overflow: hidden;
  margin-left: 10px;
  display: none;
}

.bigshow img {
  width: 900px;
  height: auto;
}

.smallshow {
  width: 100%;

  position: relative;
}

.smallshow img {
  width: 100%;
  box-sizing: border-box;
  transition: all 0.5s;
}

.smallshow > .middle_box {
  overflow: hidden;
  height: 100px;
}

.smallshow .middle {
  overflow: hidden;
  transition: all 0.5s;
  height: 100px;
}

.smallshow .middle > li {
  width: 80px;

  float: left;
  cursor: pointer;
  padding: 0 5px;
  list-style: none;
}

.smallshow > p {
  position: absolute;
  top: 50%;
  width: 22px;
  height: 32px;
  margin-top: -16px;
}

@media (max-width: 640px) {
  .bg_right {
    display: none;
  }

  .smallshow .middle > li {
    width: 80px;
    height: 80px;
    float: left;
    cursor: pointer;
    padding: 0 5px;
    list-style: none;
  }

  .showimg {
    width: auto;
  }

  .showimg img {
    width: 100%;
    height: auto;
  }

  .bg {
    width: auto;
    height: auto;
  }

  .mask {
    display: none;
  }

  .bg_left {
    width: auto;
    float: none;
  }
}

i.ion-ios-arrow-up:before {
  line-height: 1.5;
}

.bton {
  display: inline-block;
  font-weight: 400;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  border: 1px solid transparent;
  padding: .375rem .75rem;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: .25rem;
  transition: color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out
}