#scene {
    background: black;
    background-image: url("../../images/fond-systeme-solaire.jpg");
    position: relative;
    width: 720px;
    height: 680px;
    margin: 0 auto;
}
 
#sun {
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -100px;
    margin-left: -100px;    
    -webkit-animation: rot-sun 100s linear infinite;
     animation: rot-sun 100s linear infinite;
}
 
#earth {
    position: absolute;
    margin-left: -50px;
    top: 45%;
    margin-top: -50px; 
    -webkit-animation: rot-earth 1s linear infinite;
     animation: rot-earth 1s linear infinite;
}
#earth-orbit {
    position: absolute;
    top: 50%;
    left: 50%; 
    width: 500px;
    height: 500px; 
    margin-top: -250px;
    margin-left: -250px; 
    border: 2px solid #939393;
    -mozborder-radius: 50%;
    -webkitborder-radius: 50%;
    border-radius: 50%; 
    -webkit-animation: orbit 10s linear infinite;
    animation: orbit 10s linear infinite;    
    -webkit-transform: rotate(360deg) 1s linear infinite;    
    transform: rotate(360deg) 1s linear infinite;
}
 
#moon {
    margin-left: 80px;
    margin-top: -20px;
}
#moon-orbit {
    width: 200px;
    height: 200px; 
    position: absolute;
    top: 45%;
    margin-top: -100px;
    margin-left: -100px; 
    -webkit-animation: orbit 5s linear infinite;
    animation: orbit 5s linear infinite;
}
  
@-webkit-keyframes orbit {
    100%  {
        -webkit-transform: rotate(-360deg);
        transform: rotate(-360deg)
    }
}
@keyframes orbit {
    100%  {
        -webkit-transform: rotate(-360deg);
        transform: rotate(-360deg)
    }
}

@-webkit-keyframes rot-earth {
    100%  {
        -webkit-transform: rotate(-360deg);
        transform: rotate(-360deg)
    }
}
@keyframes rot-earth {
    100%  {
        -webkit-transform: rotate(-360deg);
        transform: rotate(-360deg)
    }
}

@-webkit-keyframes rot-sun {
    100%  {
        -webkit-transform: rotate(-360deg);
        transform: rotate(-360deg)
    }
}
@keyframes rot-sun {
    100%  {
        -webkit-transform: rotate(-360deg);
        transform: rotate(-360deg)
    }
}