.wrapper1 {
  width: 100%;
  height: 4rem;
  position: relative;
  background: url('../images/center-pic1.jpg') center no-repeat;
  background-size: 100%;
}
.wrapper1 .pic2 {
  position: absolute;
  height: 100%;
  right: 0;
}
.wrapper2 {
  width: 100%;
  height: 4rem;
  position: relative;
  background: url('../images/center-pic3.jpg') center no-repeat;
  background-size: 100%;
  margin-top: 3px;
}
.wrapper2 .pic2 {
  position: absolute;
  height: 100%;
  left: 0;
}
.wrapper3 {
  width: 100%;
  height: 4rem;
  position: relative;
  background: url('../images/center-pic5.jpg') center no-repeat;
  background-size: 100%;
  margin-top: 3px;
}
.wrapper3 .pic2 {
  position: absolute;
  height: 100%;
  right: 0;
}
.wrapper4 {
  width: 100%;
  height: 4rem;
  position: relative;
  background: url('../images/center-pic7.jpg') center no-repeat;
  background-size: 100%;
  margin-top: 3px;
}
.wrapper4 .pic2 {
  position: absolute;
  height: 100%;
  left: 0;
}