* {

  box-sizing: border-box;

}
body {

  font-family: 'Arial', sans-serif;

}
.scene {
     min-height: 450px;
     position: relative;
     background-color: blue;
     transform: translate3d(0, 0, 0);
     top: 0;
     left: 0;
 }
 
.level-1 {
    animation: animation_fg linear 30s infinite both;
    background: url('https://raw.githubusercontent.com/annasinkova/zadanie/refs/heads/main/фон1.png') 0 100% repeat-x;
    z-index: 5;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: 976px;
}

.level-2 {
    animation: animation_fg linear 55s infinite both;
    background: url('https://raw.githubusercontent.com/annasinkova/zadanie/refs/heads/main/фон2.png') 0 100% repeat-x;
    z-index: 4;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: 1302px;
}

.lelel-3 {
    animation: animation_fg linear 75s infinite both;
    background: url('https://raw.githubusercontent.com/annasinkova/zadanie/refs/heads/main/фон3.png') 0 100% repeat-x;
    z-index: 3;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: 1766px;
}

.level-4 {
    animation: animation_fg linear 95s infinite both;
    background: url('https://raw.githubusercontent.com/annasinkova/zadanie/refs/heads/main/фон4.png') 0 100% repeat-x;
    z-index: 2;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: 834px;
}

.level-5 {
    animation: animation_fg linear 120s infinite both;
    background: url('https://raw.githubusercontent.com/annasinkova/zadanie/refs/heads/main/фон5.jpg') 0 100% repeat-x;
    z-index: 1;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: 1302px;
}
.object-1 {
 background: url('https://raw.githubusercontent.com/annasinkova/zadanie/refs/heads/main/фон1.png') 0 100% no-repeat;
 z-index: 1;
 position: absolute;
 bottom: 100px;
 left: 0;
 width: 100%;
 height: 100%;
 background-size: auto 75px;
 animation: animation-level_object-1 linear 10s infinite both;
}

.object-2 {
 background: url('https://raw.githubusercontent.com/annasinkova/zadanie/refs/heads/main/фон2.png') 0 100% no-repeat;
 z-index: 1;
 position: absolute;
 bottom: 100px;
 left: 0;
 width: 100%;
 height: 100%;
 background-size: auto 75px;
 animation: animation-level_object-2 linear 15s infinite both;
}
@keyframes animation_fg {

  0% {

    background-position: 2765px 100%;

  }

  100% {

    background-position: 550px 100%;

  }

}
@keyframes animation_moving-object1 {

  0% {

    background-position: -300px 100%;

  }

  100% {

    background-position: 2000px 100%;

  }

}