* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.preload {
  position: fixed;
  top: 0;
  width: 100%;
  height: 100vh;
  background: #77b3d4;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: opacity 1s ease;
  z-index: 1;
}

.cloud1,
.cloud2,
.cloud3 {
  height: 100px;
  position: absolute;
  right: 0;
  animation: clouds 3s ease infinite;
  z-index: -1;
  opacity: 0;
}

.cloud1 {
  top: 25%;
  transform: translate(100%, -25%);
}
.cloud2 {
  top: 50%;
  transform: translate(50%, -25%);
  animation-delay: 2s;
}
.cloud3 {
  top: 75%;
  transform: translate(75%, -25%);
  animation-delay: 1.5s;
}

.airplane {
  height: 40%;
  animation: airplane 1s ease infinite alternate;
}

.preload h3 {
  position: absolute;
  top: 75%;
  transform: translateY(-50%);
  font-size: 30px;
  font-family: sans-serif;
  color: white;
}

section {
  height: 100vh;
  width: 100%;
  background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)),
    url("https://images.pexels.com/photos/1756325/pexels-photo-1756325.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260");
  background-size: cover;
  background-position: center;
}

section h1 {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 50px;
  font-family: sans-serif;
}

@keyframes airplane {
  from {
    transform: translateY(0px);
  }
  to {
    transform: translateY(50px);
  }
}

@keyframes clouds {
  0% {
    right: 0;
  }
  25% {
    opacity: 1;
  }
  100% {
    right: 130%;
    opacity: 0;
  }
}