Hi Joe,
Thanks for reaching out with your Crio Pro WordPress theme questions.
The easiest way to accomplish this on your site would probably be to use a plugin like Coming Soon Page & Maintenance Mode.
You can also remove your Crio header and footer with some advance CSS and add your gif to a blank page. Here’s the CSS you’d need to add to your Customizer CSS/JS Editor section:
.site-header, .site-footer {
display: none;
}
I hope this helps.