.flex-container {
    display: flex;
  }
  
  .flex-container div {
    padding: 20px;
    flex: 1 1 0%;
    background: peachpuff;
    border: 4px solid brown;
    height: 500px;
    margin: 5px;
  }
  
  .flex-container .two {
    flex: 2 1 0%;
  }
  
  .flex-container .one {
    flex: 3 1 0%;
    margin-left: 10px;
  }
  
  .flex-container .three {
    flex: 1 1 0%;
    margin-right: 10px;
  }
  
  .another-class {
    display: flex;
  }
  
  .another-class div {
    flex: 1 1 0%;
    background: peachpuff;
    border: 4px solid brown;
    height: 300px;
    width: 250px;
    margin: 5px;
  }
  
  .another-class .one {
    flex: 1 1 0%;
    margin-left: 10px;
  }
  
  .another-class .two {
    flex: 2 1 0%;
  }
  
  .another-class .three {
    flex: 3 1 0%;
    margin-right: 10px;
  }
  
  .footer-class {
    display: flex
  }
  
  .footer-class div {
    flex: 1 1 0%;
    background: tan;
    border: 4px solid brown;
    height: 200px;
    margin: 10px
  }
  
  .header-class {
    display: flex
  }
  
  .header-class div {
    text-align: center;
    padding: 30px;
    flex: 1 1 0%;
    background: tan;
    border: 4px solid brown;
    height: 70px;
    margin: 10px;
  }