.spark {
    height: 40px;
    width: 60px;
  }
  @media(max-width:479px){
  
  .footer{
      margin: 50px;
  }
  }
  
  @media(min-width:  480px) and (max-width:574px)
  {
  
  .footer{
      margin: 50px;
  }
  
  }
  
  
  @media(min-width:575px) and (max-width:767px)
  {
  .footer{
      margin: 50px;
  }
  
  }