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

html {
  font-size: 62.5%;
}

body {
  width: 100%;
  height: 100vh;
  background-color: lightgreen;
  display: grid;
  place-items: center;
}

.container {
  width: 150rem;
  height: 80rem;
  background: rgb(88, 179, 253) url(images/bg.png) repeat-x;
  background-size: 150rem auto;
  background-position: 0 100%;
  display: grid;
  place-items: center;
  animation: bgAnim 10s infinite linear;
  border-radius: 0.5rem 100rem;
}

@keyframes bgAnim {
  0% {
    background-position: 0 100%;
  }

  100% {
    background-position: 150rem 100%;
  }
}

.helicopter {
  width: 80rem;
  height: 60rem;
  position: relative;
  perspective: 100rem;
  transform: rotateY(-15deg);
}

.helicopter div {
  position: absolute;
}

.blade {
  width: 40rem;
  height: 2rem;
  background-color: #000;
  left: 20rem;
  top: 15rem;
  transform: rotateX(90deg);
  transform-style: preserve-3d;
  animation: bladeAnim 0.1s infinite linear;
}

@keyframes bladeAnim {
  0% {
    transform: rotateX(90deg) rotateZ(0);
  }

  100% {
    transform: rotateX(90deg) rotateZ(360deg);
  }
}

.main-rotor {
  width: 5rem;
  height: 2rem;
  background-color: #000;
  left: 17.5rem;
  transform: rotateX(-90deg);
  transform-style: preserve-3d;
}

.main-rotor::before {
  content: "";
  width: 100%;
  height: 100%;
  background-color: #000;
  position: absolute;
  transform: rotateY(80deg);
}

.mast {
  width: 1rem;
  height: 2rem;
  background-color: #000;
  left: 39.5rem;
  top: 17rem;
}

.cockpit {
  width: 20rem;
  height: 10rem;
  top: 18.5rem;
  left: 30rem;
  background-color: #000;
  border-radius: 50% 40% 40% 40%;
}

.cockpit::before {
  content: "";
  width: 8rem;
  height: 5rem;
  background-color: #ccc;
  position: absolute;
  top: 0.2rem;
  border-radius: 100% 0 40% 0;
}

.landing-skid {
  width: 23rem;
  height: 10rem;
  border-bottom: 1rem solid #000;
  border-left: 1rem solid transparent;
  border-right: 1rem solid transparent;
  border-radius: 0 0 2.5rem 5rem;
}

.landing-skid-1 {
  top: 22rem;
  left: 26rem;
}

.landing-skid-2 {
  top: 20.5rem;
  left: 26.5rem;
}

.landing-skid::before,
.landing-skid::after {
  content: "";
  width: 1rem;
  height: 5rem;
  background-color: #000;
  position: absolute;
  bottom: 0;
}

.landing-skid::before {
  left: 8rem;
}

.landing-skid::after {
  left: 18rem;
}

.tail-cone {
  width: 25rem;
  height: 2rem;
  background-color: #000;
  top: 22rem;
  left: 47rem;
  border-radius: 0 100% 100% 0;
}

.tail-fin {
  width: 2rem;
  height: 8rem;
  background-color: #000;
  top: 19rem;
  right: 7.5rem;
  border-radius: 100% 0 0 100%;
}

.tail-rotor {
  width: 1rem;
  height: 9rem;
  background-color: #000;
  top: 18.5rem;
  right: 6.5rem;
  animation: tailRotorAnim 0.1s infinite linear;
}

@keyframes tailRotorAnim {
  0% {
    transform: rotateX(0);
  }

  100% {
    transform: rotateX(360deg);
  }
}