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Example using wp_body_open hook to add a top banner
<?php // Ignore this first line when copying to your child theme's functions.php file.
add_action('wp_body_open', function() { ?>
.top-banner {
background-color: firebrick;
color: white;
display: grid;
font-size: 2rem;
height: 10vmin;
place-items: center;
width: 100vw;
<div class="top-banner">This is my cool Top Banner!</div>
<?php } );
* You can add the PHP code snippet to your child theme's functions.php file
* or with third-party plugins such as My Custom Functions and Code Snippets.
* /
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