.slide_box {
  width: 600px;
  height: 450px;
  margin: 0 auto;
  overflow: hidden;
  position: relative;
}

.slide_box .slide_img {
  width: 10000px;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.slide_box .slide_img li {
  float: left;
  width: 600px;
  height: 450px;
}

.slide_box .slide_img li img {
  width: 100%;
  height: 100%;
}

.slide_box:hover a { display: block; }

.slide_box a {
  display: none;
  width: 30px;
  height: 50px;
  position: absolute;
  top: 50%;
  margin-top: -25px;
  text-align: center;
  line-height: 50px;
  color: #FFFFFF;
  font-size: 20px;
  background: rgba(0, 0, 0, .6);
  z-index: 99;
}

.slide_box .btn_l { left: 0; }

.slide_box .btn_r { right: 0; }

.slide_box .slide_circle {
  width: 100%;
  height: 15px;
  text-align: center;
  position: absolute;
  bottom: 15px;
  z-index: 100;
}

.slide_box .slide_circle li {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin: 0 5px;
  border-radius: 50%;
  background: #666;
  cursor: pointer;
}

.slide_box .slide_circle .on { background: #fff; }