Page-3.css

 .u-section-1 {
  background-image: url("images/3.gif");
  background-position: 50% 50%;
}

.u-section-1 .u-sheet-1 {
  min-height: 691px;
}

@media (max-width: 1199px) {
  .u-section-1 .u-sheet-1 {
    min-height: 570px;
  }
}

@media (max-width: 991px) {
  .u-section-1 .u-sheet-1 {
    min-height: 437px;
  }
}

@media (max-width: 767px) {
  .u-section-1 .u-sheet-1 {
    min-height: 328px;
  }
}

@media (max-width: 575px) {
  .u-section-1 .u-sheet-1 {
    min-height: 207px;
  }
}