I am learning Bootstrap 5 and trying to create a 3 column layout. Column1 should be shorter than the other columns because that will be my menu. I used colors to seperate the columns and I want the second row column 1 to have a height of 150px. This is not happening. when the page loads the columns are of equal heights which is wrong. How do I fix this?
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
<title>Hello, world!</title>
<style>
body {background-color: powderblue;}
.my-first-col {
min-height: 50vh;
}
.my-second-col {
min-height: 750px;
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-3 border bg-primary">First Row</div>
</div>
<div class="row">
<div class="col-2 border bg-secondary text-white my-first-col">Second row column 1</div>
<div class="col-7 border bg-primary my-second-col">Second row column 2</div>
<div class="col-3 border bg-warning">Second row column 3</div>
</div>
<div class="row border bg-info">
<div>Here is my footer</div>
</div>
</div>
<!-- Optional JavaScript; choose one of the two! -->
<!-- Option 1: Bootstrap Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>
<!-- Option 2: Separate Popper and Bootstrap JS -->
<!--
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.2/dist/umd/popper.min.js" integrity="sha384-IQsoLXl5PILFhosVNubq5LC7Qb9DXgDA9i+tQ8Zj3iwWAwPtgFTxbJ8NT4GN1R8p" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.min.js" integrity="sha384-cVKIPhGWiC2Al4u+LWgxfKTRIcfu0JTxR+EQDz/bgldoEyl4H0zUF0QKbrJ0EcQF" crossorigin="anonymous"></script>
-->
</body>
</html>