* {
  margin: 0;
  padding: 0;
}


.yz_boxWrap {
  position: absolute;
  left: calc(50% - 300px);
  top: 250px;
  width: 600px;
  height: 450px;
  overflow: hidden;
}

.yz_boxWrap .boxImgWrap {
  height: 100%;
  position: absolute;
}

.yz_boxWrap .boxImgWrap img {
  display: block;
  float: left;
}

.yz_boxWrap .boxBottomNav {
  position: absolute;
  bottom: 0px;
  width: 100%;
  height: 15%;
  background-color: rgba(0, 0, 0, 0.5);
}

.yz_boxWrap .boxBottomNav div {
  margin: 5px auto;
  width: 85px;
}

.yz_boxWrap .boxBottomNav a {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin: 0 2px;
  border-radius: 50%;
  background-color: rgba(200,200,200,0.5);
}

.yz_boxWrap .boxBottomNav a.boxAColor { background: #f00; }

.yz_boxWrap .prev, .next {
  position: absolute;
  top: calc(50% - 40px);
  width: 40px;
  height: 40px;
  background-color: rgba(0, 0, 0, 0.5);
  border-radius: 50%;
  cursor: pointer;
  text-align: center;
  line-height: 40px;
  font-family: "宋体";
  font-size: 30px;
  color: #fff;
  font-weight: bolder;
  display: none;
}

.yz_boxWrap .prev { left: 10px; }

.yz_boxWrap .next { right: 10px; }