How to Center Div in The Page? (Height & Width)

How to center div in the page? (Height & Width)?

Create a wrapper with ID wrapper around the #myDiv element, and apply this CSS code:

#wrapper{
    display: table;
}
#myDiv{
    display: table-cell;
    vertical-align: middle; /*Vertically centered*/
    text-align: center; /* Horizontally centered */
}

This code centers elements of any width/height.

How to align a div to the middle (horizontally/width) of the page

<body>
    <div style="width:800px; margin:0 auto;">
        centered content
    </div>
</body>

Center div in middle of site

Added everything to a single html file. Commented some of the existing css which defined margin for the container. And added

width: 100%; height: 100vh; display: flex; justify-content: center; align-items: center;

to make it center. The basic idea is to containe the the div and move the div to the center of the container.
Happy hacking. Cheers.

<!doctype html>
<html>

<head>
    <meta charset="utf-8">
    <title>Super Mario</title>
    <style type="text/css">
        @charset "utf-8";
        /* CSS Document */

        .nav {
            height: 100%;
            width: 0;
            position: fixed;
            z-index: 1;
            top: 0;
            left: 0;
            background-color: #111;
            overflow-x: hidden;
            padding-top: 60px;
            transition: 0.5s;
        }

        .nav a {
            padding: 8px 8px 30px 65px;
            text-decoration: none;
            font-size: 35px;
            color: #818181;
            display: block;
            transition: 0.3s;
            font-weight: 500;
        }

        .nav a:hover {
            color: #f1f1f1;
        }

        .nav .closebtn {
            position: absolute;
            top: 0;
            right: 25px;
            font-size: 36px;
            margin-left: 50px;
        }

        .menu {
            font-size: 1.8vw;
            position: absolute;
            font-weight: bolder;
        }

        #main {
            transition: margin-left .5s;
            /* padding: 10px; */
        }

        @media screen and (max-height: 450px) {
            .nav {
                padding-top: 15px;
            }

            .nav a {
                font-size: 18px;
            }
        }

        .headerText {
            text-align: center;
        }

        .marioHeader {
            background-image: url("resources/marioBackground.jpg");
            background-size: 1800px;
            /* height: 450px; */
            background-position: bottom;
            display: flex;
            justify-content: center;
            align-items: center;
            background-repeat: repeat-x;
            background-color: #2596be;
            margin-top: 50px;
            text-align: center;
            flex-direction: column;
            border-style: solid;
            border-width: 10px;
            /* margin-bottom: 350px; */
            max-width: 1800px;
            /* margin-left: auto;
            margin-right: auto; */

        }

        .title {
            font-size: 50px;
            font-weight: bolder;
        }

        .headermario {
            background-image: url("resources/banner.png");
            background-size: 600px;
            background-repeat: no-repeat;
            background-position: bottom;
            background-color: red;
            height: 200px;
            min-width: 70%;
            margin-bottom: 100px;
            border-style: solid;
            border-width: 10px;
        }

        .topnav {
            overflow: hidden;
            display: flex;
            justify-content: center;
            margin-top: 230px;
        }

        .topnav a {
            float: left;
            color: red;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none;
            font-size: 23px;
            border-left: 1px solid;
            border-right: 1px solid;
            text-shadow: #000 0px 0px 1px, #000 0px 0px 1px, #000 0px 0px 1px, #000 0px 0px 1px, #000 0px 0px 1px, #000 0px 0px 1px, #000 0px 0px 1px, #000 0px 0px 1px;

        }

        .topnav a:hover {
            background-color: #ddd;
            color: black;
        }

        .menu {
            cursor: pointer;
        }

        .aboutp {
            width: 1000px;
            text-align: center;
            display: block;
            margin: auto;
        }

        .mario {
            display: block;
            margin-left: auto;
            margin-right: auto;
            width: 200px;
        }

        .topContent {
            background-color: red;
            height: 100px;
            width: 70%;
            margin: auto;
            justify-content: center;
            align-items: center;
            display: flex;
            max-width: 700px;
        }

        .mainContent {
            height: 100%;
            width: 100%;
            margin: 0 auto 50px;
            justify-content: center;
            align-items: center;
            display: flex;
            flex-wrap: wrap;
            max-width: 768px;

        }

        .left {
            width: 15%;
        }

        .right {
            width: 15%;
        }

        .center {
            width: 70%;
            background-color: antiquewhite;
            min-height: 50%;
        }

        .bottom {
            background-color: red;
            width: 100%;
            height: 100px;
            max-width: 1800px;
            margin: auto;
        }

        body {
            background-color: saddlebrown;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
        }

        .mariogif {
            float: right;
            width: 200px;
            margin: auto 20px auto 10px;
        }
    </style>
    <script type="text/javascript">
        function openNav() {
            document.getElementById("nav").style.width = "250px";
            document.getElementById("main").style.marginLeft = "250px";
        }

        function closeNav() {
            document.getElementById("nav").style.width = "0";
            document.getElementById("main").style.marginLeft = "0";
        }
    </script>
</head>

<body>

    <div id="nav" class="nav">
        <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">×</a>
        <a href="index.html">Home</a>
        <a href="menu/info.html">About</a>
        <a href="menu/history.html">History</a>
    </div>
    <span class="menu" onclick="openNav()">☰ Menu</span>
    <div id="main" style="width: 100%; height: 100vh; display: flex; justify-content: center; align-items: center;">

        <div class="marioHeader" style="width: 70%">
            <h1 class="title">Super Mario</h1>
            <div class="headermario">
                <div class="topnav">
                    <a href="menu/info.html">About</a>
                    <a href="menu/history.html">History</a>
                </div>
            </div>

        </div>

    </div>

</body>

</html>

How to Center Div in The Page? (Height & Width)

How to center div in the page? (Height & Width)?

How to align a div to the middle (horizontally/width) of the page

Center div in middle of site

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