-webkit-scrollbar {
    display: none;
  }

  /* This is so that browsers that don't implement the WebKit prefix still pass the test */
  @supports not selector(::-webkit-scrollbar) {
    :root {
      overflow: hidden;
    }
  }

  :root,
  body {
    margin: 0;
    padding: 0;
  }

  #content {
    height: 10vh;
    width: 100%;
    background: lightsalmon;
  }

  #expander {
    /* force vertical scroll */
    height: 200vh;
    width: 300px;
    background: gray;
  }
</style>

<body>

  <div id="content