.img-center {
  margin: 10px auto 10px;
  display: block;
}

.img-div-center{
  height: 800px;
  position: relative;
}
.img-center-vert-hor{
  width: 85%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}