Here is the example when no margin is added
Here is when I add mt-5 ( same as margin-top:somevalue ) class to div where h1 and p elements are.
As you can see, the image slides down.
Here is the code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<link
href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css"
rel="stylesheet"
integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC"
crossorigin="anonymous"
/>
<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>
<link rel="stylesheet" type="text/css" href="/css/stylelogin.css" />
<style>
.myHeading {
}
</style>
</head>
<body>
<div class="container">
<div class="myHeading text-center text-light mt-5">
<h1 class=>Foodify Restaurant</h1>
<p class="">Log in to see menu</p>
</div>
</div>
</body>
</html>