Ryan Boudreaux includes all the code snippets you'll need in this demo of how to create an image hover-preview effect using HTML, CSS, and JavaScript.

Open your website's stylesheet in Notepad or your code editor. At the top of the code, write a style rule setting the entire page and HTML body to 100 percent height:html, body { height: 100%; } ...

Make the images too small, and blog visitors might not notice them. ... Click the "HTML" button at the top of the editing box, and an HTML editor displays the post's HTML code.