You can set a single image as a full-page, fixed background on a landing page using custom CSS, so it covers the whole viewport behind your content.
This uses custom CSS and is not an official Unbounce feature.
Add a full-page background image
Add a stylesheet to your page with the following, replacing the image URL with your own:
<style>
body {
background: url('https://your-image-url.com/image.jpg') no-repeat center center fixed;
background-size: cover;
}
</style>The fixed keyword keeps the image in place while the visitor scrolls, and cover scales it to fill the screen.