@media (min-width: 521px) {
  html {
    background: #eeeeee;
  }

  body,
  #app {
    width: 100%;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    background: #ffffff;
  }

  .navBar {
    width: 100% !important;
    max-width: 500px !important;
    left: 50% !important;
    right: auto !important;
    transform: translateX(-50%);
  }
}