I'm new to Bootstrap and would like to create a grid that looks like this:

Here is my code (which is not giving the desired result):
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/css/bootstrap.min.css"
rel="stylesheet"
integrity="sha384-F3w7mX95PdgyTmZZMECAngseQB83DfGTowi0iMjiWaeVhAn4FJkqJByhZMI3AhiU"
crossorigin="anonymous">
<title>foo</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-6 border justify-content-center">
Area 1
</div>
<div class="col-6 border justify-content-center">
Area 2
</div>
</div>
<div class="row">
<div class="col-6 border justify-content-center">
Area 3
</div>
<div class="col-6 border justify-content-center">
Area 4
</div>
</div>
</div>
</div>
</body>
</html>
Currently, the grid is rendering like this:
How can I fix up my code to get the desired structure (particularly the heights)?
Thank you.
