.effect_fade {
  opacity: 0;
  transition: opacity 0.3s ease;
}

.effect_fade.visible {
  opacity: 1;
}

.effect_up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.effect_up.visible {
  opacity: 1;
  transform: translateY(0);
}

.effect_left {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.effect_left.visible {
  opacity: 1;
  transform: translateX(0);
}

.effect_right {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.effect_right.visible {
  opacity: 1;
  transform: translateX(0);
}