CodePen Embed - scroll-noscroll

<div id="outer">
    <div id="mydiv">
        <ul>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
</div>

ul {
  margin: 0px;
  padding: 0px;
  width: 200px;
  height: 400px;
  background-color: yellowgreen;
}
li {
  list-style: none;
  width: 200px;
  height: 75px;
  background-color: darkgray;
  border-bottom: 2px solid red;
}
#outer{
  width: 200px;
  overflow: hidden;
}
#mydiv {
  overflow-y: scroll;
  width: 250px;
  height: 400px;
  background-color: lightskyblue;
}

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