body {
    background: #479a70;
  }
  
  .container {
    background: rgba(255, 255, 255, .7);
    box-shadow: 0 0 5px black;
  }
  
  .max-opacity {
    opacity: 1 !important;
    transition: opacity 2s;
  }
  
  #result-row {
    opacity: 0;
  }
  .numbers { 
    min-height: 100px;
  }
  
  .nr {
    font-family: sans-serif;
    text-align: center;
    margin: 10px;
    background: #ecd383;
    font-weight: bold;
    font-size: 24px;
    box-shadow: inset 5px -5px 15px rgba(0, 0, 0, .8), 
                inset -5px 5px 5px rgba(0, 0, 0, .2), 
                0 0 10px black;
    color: #333;
    width: 64px;
    height: 64px;
    line-height: 64px;
    border-radius: 50%;
    border: 2px solid black;
    transform: scale(1.0);
    opacity: 1;
    transition: transform 1s linear, opacity 1s linear;
  }
  .nr.init {
    transform: scale(3);
    opacity: 0;
  }
  
  .nr.active {
    transition: all 3s ease-out;
    background: #f77;
    transform: scale(1.35);
    
  }