.bgimage {
  background-attachment: fixed;
  background-size: cover;
  background-position: 50% 50%;
  background-repeat: no-repeat;
}

#bgimg1 {
  background-image: url(../images/ph1.jpg);
  height: 800px;
}
#bgimg2 {
  background-image: url(../images/ph2.jpg);
  height: 800px;
}
#bgimg3 {
  background-image: url(../images/ph3.jpg);
  height: 800px;
}
#bgimg4 {
  background-image: url(../images/ph4.jpg);
  height: 800px;
}