.section-d {
  opacity: 0;
  transform: translateY(-50px);
  transition: all 0.6s ease-out;
}

.section-d.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-u {
  opacity: 0;
  transform: translateY(50px);
  transition: all 1s ease-out;
}


.section-u.visible {
  opacity: 1;
  transform: translateY(0);
}


.section-l {
  opacity: 0;
  transform: translateX(-50px);
  transition: all 1s ease-out;
}

.section-l.visible {
  opacity: 1;
  transform: translateX(0);
}


.section-r {
  opacity: 0;
  transform: translateX(50px);
  transition: all 1s ease-out;
}

.section-r.visible {
  opacity: 1;
  transform: translateX(0);
}