body {
      color: white;
      background-color: #202A44;
      background-repeat: no-repeat;
      font-size: 120%;
  }

#computer, .second {
      width: 25%;
      position: fixed;
      bottom: 0;
      right: 2.5%;
  }

#popup:hover {
      
  }
  
#a img.second {
    display: none;
}

#a:hover img.first {
    display: none;
}

#a:hover img.second {
    width: 25%;
    display: inline-block;
}