Centering the content of a div in Bootstrap 4 - css

I have been trying various combinations for the past one two hours and I am unable to get this basic thing right. I am using Bootstrap 4 and I have an image and a login dialog just beneath it.
I took the basic boiler plate code from Bootstrap 4 and tried to do alignment using
https://getbootstrap.com/docs/4.0/layout/grid/#horizontal-alignment
https://getbootstrap.com/docs/4.0/layout/grid/#vertical-alignment
but in vain. I request you to tell me what part I a missing.
Here is my html file.
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<link rel="stylesheet" href="css/custom.css">
<title>Hey - A group chat messenger!</title>
</head>
<body>
<div class="container-fluid">
<div class="row justify-content-center">
<div class="col-4">
<img src="hey_logo.png" id="logo" class="img-fluid">
</div>
</div>
<div class="row justify-content-center">
<div class="col-4">
<button type="submit" class="btn btn-primary">Login with Google</button>
</div>
</div>
<div class="row justify-content-center">
<div class="col-4">
<small id="subtextMessage" class="form-text text-muted">Say Hey! to new beginnings</small>
</div>
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js#1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
</script>
</body>
</html>
Thanks,
Pavan.


The above problem can be resolved by using a separate row with centre-aligned content for each element (image, button, text) inside a column.
Here is the working code:
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<link rel="stylesheet" href="css/custom.css">
<title>Hey - A group chat messenger!</title>
</head>
<body>
<div class="container-fluid">
<div class="row justify-content-center">
<div class="col-sm-3">
<div class="row justify-content-md-center">
<img src="/hey-logo.png" id="logo" class="img-fluid">
</div>
<div class="row justify-content-md-center">
<button type="submit" class="btn btn-primary">Login with Google</button>
</div>
<div class="row justify-content-md-center">
<small id="subtextMessage" class="form-text text-muted">Say Hey! to new beginnings</small>
</div>
</div>
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js#1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
</script>
</body>
</html>
Output:


A button is an inline-block element in Bootstrap. Try using the text-center.
<div class="row">
<div class="col-4 text-center">
<button type="submit" class="btn btn-primary">Login with Google</button>
</div>
</div>
If it looks not fine (for example the image is not symettric), then give the col-4 some padding on the left or right side.

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I dont know your code but you can try to use row in row
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I want all divs to be visible of tablet, laptop or larger devices, but on mobile I want to hide Staff and phone number.
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Template is copied from Bootstrap's official site.

Is it not hitting the xs screen size maybe? Is there a min-width on anything. I would try .d-sm-none .d-md-block and see if that works for the screen size you are testing.

I'm just throwing this out to show you, and then I can erase it. Everything is working as you say, the Mobile View staff and phone number are lost. Where is the problem ?
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https://plnkr.co/edit/62cdPp29PtjfldEbGGra?p=preview

Please try this:
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