.banner {
  position: relative;
  overflow: hidden;
}
.banner .slick-arrow {
  position: absolute;
  font-size: 0;
  top: 50%;
  z-index: 12;
  width: 100px;
  height: 100px;
  margin-top: -42px;
  border: 0;
}
.banner .slick-prev {
  outline: none;
  position: absolute;
  top: 50%;
  width: 52px;
  height: 52px;
  z-index: 9;
  text-align: center;
  margin-top: -40px;
  transition: .8s;
  background: url(../image/c_prev.png) no-repeat;
  left: 5%;
  opacity: 0;
  cursor: pointer;
}
.banner .slick-next {
  outline: none;
  position: absolute;
  top: 50%;
  width: 52px;
  height: 52px;
  z-index: 9;
  text-align: center;
  margin-top: -40px;
  transition: .8s;
  background: url(../image/c_next.png) no-repeat;
  right: 5%;
  opacity: 0;
  cursor: pointer;
}
.banner:hover .slick-prev {
  left: 10%;
  opacity: 1;
}
.banner:hover .slick-next {
  right: 10%;
  opacity: 1;
}
.banner img {
  display: block;
  width: 100%;
  margin: 0 auto;
}
.slick-dots {
  position: absolute;
  left: 0;
  font-size: 0;
  bottom: 5%;
  width: 100%;
  text-align: center;
  outline: none;
}
.slick-dots li {
  display: inline-block;
  margin: 0 15px;
  outline: none;
}
.slick-dots li button {
  display: block;
  border: 0 none;
  width: 41px;
  height: 4px;
  background: url(../image/ban-dd.png) no-repeat center;
  transition: .5s;
}
.slick-dots .slick-active button {
  background: url(../image/ban-dd_h.png) no-repeat center;
}