IFrame not scrolling on IOS Safari

I have an IFrame on a webpage when I use IOS Safari I have a bug where it doesn't let me scroll down. I've done a lot of research around this and see its a common bug, but I can't seem to get my version working. The most descriptive solution is How to get an IFrame to be responsive in iOS Safari?.

Although I can't get that method working for me. Heres what I have so far:

index.html

html,
body {
  padding: 0;
  margin: 0;
  border: 0;
}

iframe {
  position: fixed;
  width: 100%;
  height: 100vh;
  top: 0;
  border: 0;
  z-index: 9999;
  /* overflow: auto; */
}

#scroll-wrapper {
  -webkit-overflow-scrolling: touch!important;
  overflow-y: scroll;
  width: 100%;
  height: 150vh;
  z-index: 9999;
}

<!DOCTYPE html>
<html>

<head>
  <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">
</head>

<body>

  <!-- <div id="scroll-wrapper"> -->
  <iframe src="iframe.html" allowtransparency="true"></iframe>
  <!-- </div> -->

</body>

</html>

iframe.html

html,
body {
  padding: 0;
  margin: 0;
  border: 0;
  width: 1px;
  min-width: 100%;
  *width: 100%;
}

div {
  display: block;
  margin: 0 auto;
  max-width: 300px;
  width: 100%;
  height: 1000px;
  border: 3px solid grey;
  text-align: center;
  line-height: 150px;
  margin-bottom: 50px;
  margin-top: 50px;
}

<!DOCTYPE html>
<html>

<head>
  <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">

</head>

<body>

  <div>Context1</div>

</body>

</html>

Solution

Uncomment <div id="scroll-wrapper"> and add this style for iframe wrapper:

#scroll-wrapper {
    -webkit-overflow-scrolling: touch;
    overflow-y: scroll;
}

See David's post about this trick