.control-box {
    width: 1400px; overflow:hidden; margin:0px auto; 


}
.control-box ul {
  list-style: none;
  position: relative;
}
.control-box ul li {
  position: absolute;

  cursor: pointer;
}
.prev {
  left: 0;
}
.next {
  right: 0;
}
.bigbox {
  overflow: hidden;
  width:1300px; 
  height: 340px;
  margin: auto 50px auto;
}
#switcher {
  height: 300px;
  left: 0px;
}
.content_1 .content_2 {
  width: 100%;
  float: left;
}
.box{ text-align:center;
  width: 300px;
  height: 340px; overflow:hidden;
  float: left;

}
.box:hover {
 opacity:0.5;
}