My bootstrap 4-based HTML page is looking good on most screens, but when I try to print it, the content is vertically centered in the print layout. How can I ensure that the content is displayed at the top of the paper?
Below is the HTML code snippet for reference:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<title>my title</title>
</head>
<body>
<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top .d-print-none">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault"
aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand" href="#"><img src="/logo.png" alt="myalt" class="logoIMG"></a>
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="navbar-nav mr-auto">
<li class="nav-item">
<a class="nav-link" href="/workers">Add worker</a>
</li>
<li class="nav-item">
<a class="nav-link" href="/workers/list">List workers</a>
</li>
<li class="nav-item">
<a class="nav-link" href="/logout">Logout</a>
</li>
</ul>
</div>
</nav>
<div class="container mt-5">
<div class="row">
<div class="col-md-12">
<div class="text-center">
<img class="mb-4" src="/logo.png" alt="" class="img-fluid" style="max-width: 40%; height: auto;">
</div>
<h1>Checklist for new worker</h1>
<ul>
<li>lorem: lorem</li>
<li>lorem: lorem</li>
<li>lorem: lorem</li>
</ul>
<h3>lorem</h3>
<ul>
<li>lorem: lorem</li>
</ul>
<h3>lorem</h3>
<ul>
<li>lorem lorem</li>
<li>lorem lorem</li>
<li>lorem lorem</li>
<li>lorem</li>
<li>lorem lorem</li>
<li>lorem</li>
<li>lorem lorem</li>
<li>lorem</li>
<li>lorem</li>
<li>lorem lorem</li>
<li>lorem</li>
<li>lorem</li>
<li>lorem</li>
<li>lorem</li>
<li>lorem Quick lorem</li>
<li>lorem</li>
<li>lorem lorem (only lorem)</li>
</ul>
</div>
</div>
</div>
</main>
<style>
.logoIMG {
height: 2rem;
width: auto;
}
</style>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous"></script>
<style>
html,
body {
height: 100%;
}
body {
display: -ms-flexbox;
display: -webkit-box;
display: flex;
-ms-flex-align: center;
-ms-flex-pack: center;
-webkit-box-align: center;
align-items: center;
-webkit-box-pack: center;
justify-content: center;
flex-wrap: wrap;
padding-top: 40px;
padding-bottom: 40px;
background-color: #f5f5f5;
}
</style>