html, body {
    /* The universe takes up all available space */
    width: 100%;
    height: 100%;
    
    /* The universe is black */
    background-color: black;
}

#sun {
    position: absolute;
    /* Positions the top-left corner of the image to be *
    /* in the middle of the box */
    top: 50%;
    left: 50%;
    
    /* Play with these numbers to see what it does */
    height: 400px;
    width: 498px;
    margin-top: -200px; 
    margin-left: -248px;
}

#earth {
    position: absolute;
    top:80;
    left:80;
    width: 15%;
    height: 15%;
    
    margin-left: -25px;
    margin-top: -25px;
}

#earth-orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 750px;
    height: 750px;
    margin-top: -375px;
    margin-left: -375px;
    
    border-width: 2px;
    border-style: dotted;
    border-color: white;
    border-radius: 50%;
    
    -webkit-animation: spin-right 365s linear infinite;
       -moz-animation: spin-right 365s linear infinite;
        -ms-animation: spin-right 365s linear infinite;
         -o-animation: spin-right 365s linear infinite;
            animation: spin-right 365s linear infinite;
}

#moon {
    position: absolute;
    top:50;
    left:50;
    width: 25%;
    height: 25%;
    
    margin-left: -45px;
    margin-top: -45px;
}

#moon-orbit {
    top: 50%;
    left: 50%;
    width: 250px;
    height: 250px;
    margin-top: -15px;
    margin-left: -15px;
    
    border-width: 2px;
    border-style: dotted;
    border-color: white;
    border-radius: 50%;
    
    -webkit-animation: spin-right 30s linear infinite;
       -moz-animation: spin-right 30s linear infinite;
        -ms-animation: spin-right 30s linear infinite;
         -o-animation: spin-right 30s linear infinite;
            animation: spin-right 30s linear infinite;
}

@-webkit-keyframes spin-right {
    100% {
        -webkit-transform: rotate(360deg);
           -moz-transform: rotate(360deg);
            -ms-transform: rotate(360deg);
             -o-transform: rotate(360deg);
                transform: rotate(360deg);
    }
}
@keyframes spin-right {
  100% {
    -webkit-transform: rotate(360deg);
       -moz-transform: rotate(360deg);
        -ms-transform: rotate(360deg);
         -o-transform: rotate(360deg);
            transform: rotate(360deg);
  }
}

#signature {
  position: absolute;
  right: 0;
  bottom: 0px;
  font-size: 10;
  color: yellow;
}