* {
  margin: 0;
  padding: 0;
}

.main {
  height: 100vh;
  width: 100%;
  background-image: url(img/sky.jpg);
  background-size: cover;
  background-position: center;
  position: relative;
  overflow-x: hidden;
}

.highway {
  height: 200px;
  width: 500%;
  display: block;
  background-image: url(img/road.jpg);
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1;
  background-repeat: repeat-x;
  animation: highway 5s linear infinite;
}

@keyframes highway {
  100% {
    transform: translateX(-3400px);
  }
}

.city {
  height: 250px;
  width: 500%;
  background-image: url(img/city.png);
  position: absolute;
  bottom: 200px;
  left: 0;
  right: 0;
  display: block;
  z-index: 1;
  background-repeat: repeat-x;
  animation: city 20s linear infinite;
}

@keyframes city {
  100% {
    transform: translateX(-1400px);
  }
}

.car {
  width: 400px;
  left: 50%;
  bottom: 100px;
  transform: translateX(-50%);
  position: absolute;
  z-index: 2;
}

.car img {
  width: 100%;
  animation: car 1s linear infinite;
}

@keyframes car {
  100% {
    transform: translateY(-1px);
  }

  50% {
    transform: translateY(1px);
  }

  0% {
    transform: translateY(-1px);
  }
}

.wheel {
  left: 50%;
  bottom: 178px;
  transform: translateX(-50%);
  position: absolute;
  z-index: 2;
}

.wheel img {
  width: 72px;
  height: 72px;
  animation: wheel 1s linear infinite;
}

.back-wheel {
  left: -165px;
  position: absolute;
}

.front-wheel {
  left: 80px;
  position: absolute;
}

@keyframes wheel {
  100% {
    transform: rotate(360deg);
  }
}