.hidden-block1,
.hidden-block2,
.hidden-block3,
.hidden-block4 {
  opacity: 0;
  pointer-events: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  transition: opacity 0.3s ease;
}

.hidden-block1.active,
.hidden-block2.active,
.hidden-block3.active,
.hidden-block4.active {
  opacity: 1;
  pointer-events: auto;
}