How to make curved lines inside of div

Trying to make border-rounded div containing curved lines just like the screenshot below.
White boxes would be some texts as display:flex applied on that div.

Not too sure to make the two curved lines in it.

Tried so far..

<!DOCTYPE html>
<html>
<head>
<style>
body {
  background-color:#E7E9EB;
}
#myDIV {
  height:300px;
  background-color:#FFFFFF;
  border: 1px solid black;
  border-radius: 8% / 50%;
  padding:20px;
  position: relative;
  display: flex;
  justify-content: center;
}
#myDIV:after {
  content: '';
  height:300px;
  width: 80%;
  background-color:#FFFFFF;
  border: 1px solid red;
  border-radius: 8% / 50%;
  padding:20px;
  position: absolute;
  bottom:0;
}
#text {
z-index: 999;
}
</style>
</head>
<body>

<h1>The border-radius Property</h1>

<div id="myDIV">
<p id="text">A demonstration of how to add rounded corners.</p>
</div>

</body>
</html>

Please help me out to achieve this design.

Thanks in advance.

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