.desc {
  
    opacity: 0;
    transition: 1.5s 1.5s;
}

@media screen and (max-width: 450px) {
    .videobigtit {
        font-size: 3rem;
    }
  
}
.ex1 {
  opacity: 0;
  perspective: 200px;
}
.ex1 span {
  transform: rotateY(-90deg);
  opacity: 0;
}

.ex2 {
  opacity: 0;
  perspective: 200px;
}
.ex2 span {
  transform: rotateY(-90deg) rotateX(45deg);
  transform-origin: -50% 75%;
  opacity: 0;
}

.container {
    width: 100%;
    height: 100%;
}