.logo {
  background: url('/assets/img/l_openFDA.png');
  width: 189px;
  height: 34px;
  display: block;
}
.logo-fda {
  background: url('/assets/img/l_FDA.png');
  width: 62px;
  height: 25px;
  display: block;
}

@media screen and (-webkit-min-device-pixel-ratio: 1.5), (min-resolution: 144dpi) {
  .logo {
    background-image: url('/assets/img/l_openFDA@2x.png');
    background-size: 189px 34px;
  }
  .logo-fda {
    background-image: url('/assets/img/l_FDA@2x.png');
    background-size: 62px 25px;
  }
}