solar.css

html, body {
    /* width: 100%;
    height: 100%; */
    background-color: #121215;
  }
  
  .solar-system {
    position: relative;
    width: 780px;
    height: 780px;
    margin: auto;
    overflow: hidden;
  }
  
  /* Some positioning rules that are common for all objects */
  .orbit {
    border: 1px dashed #666;
  }
  
  #sun, .orbit, .orbit + div, .orbit + div > div {
      position: absolute;
  }
  
  #sun, .orbit, .orbit + div {
      top: 50%;
      left: 50%;
  }
  .orbit + div > div {
      top: 0;
    left: 50%;
  }
  
  .orbit, .orbit + div div, #earth {
      border-radius: 50%;
  }
  
  
  /* Individual objects rules. They are pretty much the same for 
  all objects and basically only vary in orbit size 
  and planet size. And colors :) */
  
  #sun {
      /* Positions the top-left corner of the image to be *
      /* in the middle of the box */
      height: 200px;
      width: 200px;
      background-color: #fae20a;
    margin-top: -100px; 
    margin-left: -100px;
    border-radius: 50%;
    box-shadow: 0 0 84px orange;
  }
  
  #earth {
      position: absolute;
      top: 0;
    left: 50%;
    height: 50px;
    width: 50px;
    margin-left: -25px;
    margin-top: -25px;    
    border-radius: 50%;
    box-shadow: 0 0 34px #3a4385;
  }
  
  .earth-orbit, .earth-spin {
    width: 500px;
    height: 500px;
    margin-left: -250px;
    margin-top: -250px;   
  }
  
  #moon {
    margin-top: -6px;
    margin-left: -6px;
    height: 12px;
    width: 12px;
    border-radius: 50%;
    background: white;
    box-shadow: 0 0 14px #3a4385;
  }
  .moon-orbit, .moon-spin {
    height: 90px;
    width: 90px;
    margin-top: -45px;
    margin-left: -45px;
    border-color: #447;
  }
  
  #venus {
    margin-top: -20px;
    margin-left: -20px;
    height: 40px;
    width: 40px;
    background-color: #3498db;
    box-shadow: 0 0 34px #3a4385;
  }
  .venus-orbit, .venus-spin {
    margin-top: -185px;
    margin-left: -185px;
    width: 370px;
    height: 370px;
  }
  
  #mercury {
    margin-top: -13.5px;
    margin-left: -13.5px;
    height: 25px;
    width: 25px;
    background-color: #a65e22;
    /* box-shadow: 0 0 34px #3a4385; */
  }
  
  .mercury-orbit, .mercury-spin {
  
    width: 280px;
    height: 280px;
    margin-left: -140px;
    margin-top: -140px;   
  }
  
  #mars {
    margin-top: -16px;
    margin-left: -16px;
    height: 32px;
    width: 32px;
    background-color: #863222;
    box-shadow: 0 0 14px #a64232;
  }
  
  .mars-orbit, .mars-spin {
    width: 700px;
    height: 700px;
    margin-left: -350px;
    margin-top: -350px;   
  }
  
  
  /* Spinning animations */
  
  @keyframes spin-right {
    100% {
      transform: rotate(360deg);
    }
  }
  
  .earth-spin {
    animation: spin-right 36.5s linear infinite;
  }
  .moon-spin {
    animation: spin-right 3s linear infinite;
  }
  .venus-spin {
    animation: spin-right 22s linear infinite;
  }
  .mercury-spin {
    animation: spin-right 8.8s linear infinite;
  }
  .mars-spin {
    animation: spin-right 68.7s linear infinite;
  }