.u-section-1 {
  background-image: linear-gradient(0deg, rgba(0,0,0,0.1), rgba(0,0,0,0.1)), url("images/tom-ban.jpg");
  background-position: 50% 50%;
}

.u-section-1 .u-sheet-1 {
  min-height: 648px;
}

.u-section-1 .u-btn-1 {
  border-style: none none solid;
  font-size: 1rem;
  margin: 500px auto 60px;
  padding: 0;
}

@media (max-width: 1199px) {
  .u-section-1 .u-sheet-1 {
    min-height: 537px;
  }

  .u-section-1 .u-btn-1 {
    margin-top: 383px;
  }
}

@media (max-width: 991px) {
  .u-section-1 .u-sheet-1 {
    min-height: 469px;
  }

  .u-section-1 .u-btn-1 {
    margin-top: 335px;
  }
}

@media (max-width: 767px) {
  .u-section-1 .u-sheet-1 {
    min-height: 421px;
  }

  .u-section-1 .u-btn-1 {
    margin-top: 291px;
  }
}

@media (max-width: 575px) {
  .u-section-1 .u-sheet-1 {
    min-height: 377px;
  }

  .u-section-1 .u-btn-1 {
    margin-top: 254px;
  }
}