/* hide mobile version by default */
  .logo .mobile {
    display: none;
  }
  .logo .desktop { width:400px}
  /* when screen is less than 600px wide
     show mobile version and hide desktop */
  @media (max-width: 600px) {
    .logo .mobile {
      display: block;
    }
    .logo .desktop {
      display: none;
    }
  }