Please try the snippet of code I am sharing with you in this response. I added the height: 100vh; corresponding to the 100% of the viewport height, applied to both html and body to keep the consistency of the height to the max of the screen since they don’t have a default size. Also, since it is kind of hard to calculate the max width of any screen and subtract the 20px of padding that you have on the HEADER tag in each screen scenario, an overflow:hidden rule has been added to this element.
I also added the P tag to test the div with the class .main-content with some actual content on it to test the whole site with some real content on it.
I am assuming you are using some JavaScript HTML Markup template generator language tool such as EJS to create this page, hence I have temporarily replaced <%- body %> and <%- include ('../partials/header.ejs') %> blocks with real content to see the end result. Don’t forget about placing them back instead of my hard-coded content, please.
I certainly hope this helps. Cheers, champion!
html {
font-family: Arial, Helvetica, sans-serif;
height: 100vh;
padding: 0;
}
body {
padding: 0;
margin: 0;
height: 100vh;
min-height: 100%;
color:#b2d8d8;
box-sizing: border-box;
background-color: #004c4c;
overflow: hidden;
}
header {
background-color: #189ad3;
color: #f9fafc;
text-align: left;
height: 5%;
padding: 20px;
display: flex;
width: 100%;
position:relative;
}
.main-content {
height: 100%;
}
p {
padding: 10px;
text-align: justify;
text-justify: inter-word;
}<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>HTML5 BoilerPlate - Alvison Hunter</title>
<meta name="description" content="HTML5 BoilerPlate - Alvison Hunter">
<meta name="author" content="https://alvisonhunter.com/">
<link rel="stylesheet" href="css/styles.css?v=1.0"> </head>
<body>
<header> <a id="aaa" href="/">AAA</a>
<nav id="topnav"> --- </nav>
</header>
<div class="main-content">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
<script src="js/scripts.js"></script>
</body>
</html>