* {
  box-sizing: border-box;
}


body {
  font-family: 'Arial', sans-serif; 
}


.scene {
  width: 100%;
  height: 100%;
  min-height: 450px;
  position: relative;
  top: 0;
  left: 0;
  background-color: #87CEEB; 
  transform: translate3d(0, 0, 0);
  overflow: hidden; 
}


.layer-1 {
  animation: animation_fg_1 linear 30s infinite both;
  background: url('https://github.com/vikaakkerman/cards/blob/18607e40524d8c5438254995ef5f7ac6ab03402a/Frame%2014.png') 0 100% repeat-x;
  z-index: 1;
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: auto 145px;
}

.layer-2 {
  animation: animation_fg_2 linear 55s infinite both;
  background: url('https://github.com/vikaakkerman/cards/blob/18607e40524d8c5438254995ef5f7ac6ab03402a/Frame%2017.png') 0 100% repeat-x;
  z-index: 2;
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: auto 180px;
}

.layer-3 {
  animation: animation_fg_3 linear 75s infinite both;
  background: url('https://github.com/vikaakkerman/cards/blob/18607e40524d8c5438254995ef5f7ac6ab03402a/Frame%2018.png') 0 100% repeat-x;
  z-index: 3;
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: auto 220px;
}

.layer-4 {
  animation: animation_fg_4 linear 95s infinite both;
  background: url('https://github.com/vikaakkerman/cards/blob/18607e40524d8c5438254995ef5f7ac6ab03402a/Frame%2019.png') 0 100% repeat-x;
  z-index: 4;
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: auto 260px;
}

.layer-5 {
  animation: animation_fg_5 linear 120s infinite both;
  background: url('https://github.com/vikaakkerman/cards/blob/18607e40524d8c5438254995ef5f7ac6ab03402a/Frame%2020.png') 0 100% repeat-x;
  z-index: 5;
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: auto 300px;
}


.moving-object-1 {
  background: url('https://github.com/vikaakkerman/cards/blob/18607e40524d8c5438254995ef5f7ac6ab03402a/Frame%2015.png') 0 100% no-repeat;
  z-index: 6;
  position: absolute;
  bottom: 100px;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: auto 75px;
  animation: animation_moving_object_1 linear 10s infinite both;
}

.moving-object-2 {
  background: url('https://github.com/vikaakkerman/cards/blob/18607e40524d8c5438254995ef5f7ac6ab03402a/Frame%2016.png') 0 100% no-repeat;
  z-index: 7;
  position: absolute;
  bottom: 150px;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: auto 90px;
  animation: animation_moving_object_2 linear 15s infinite both;
}


.moving-object-2-duplicate {
  background: url('https://github.com/vikaakkerman/cards/blob/18607e40524d8c5438254995ef5f7ac6ab03402a/Frame%2016.png') 0 100% no-repeat;
  z-index: 8;
  position: absolute;
  bottom: 150px;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: auto 90px;
  animation: animation_moving_object_2 linear 25s infinite both;
}


@keyframes animation_fg_1 {
  0% {
    background-position: 2765px 100%;
  }
  100% {
    background-position: 550px 100%;
  }
}

@keyframes animation_fg_2 {
  0% {
    background-position: 3000px 100%;
  }
  100% {
    background-position: 600px 100%;
  }
}

@keyframes animation_fg_3 {
  0% {
    background-position: 3500px 100%;
  }
  100% {
    background-position: 700px 100%;
  }
}

@keyframes animation_fg_4 {
  0% {
    background-position: 4000px 100%;
  }
  100% {
    background-position: 800px 100%;
  }
}

@keyframes animation_fg_5 {
  0% {
    background-position: 4500px 100%;
  }
  100% {
    background-position: 900px 100%;
  }
}

/* 10. Keyframes для движущихся объектов */
@keyframes animation_moving_object_1 {
  0% {
    background-position: -300px 100%;
  }
  100% {
    background-position: 2000px 100%;
  }
}

@keyframes animation_moving_object_2 {
  0% {
    background-position: -500px 100%;
  }
  100% {
    background-position: 2500px 100%;
  }
}