Overlays are a great way to add a little extra to your site. They can be used to show a message, a warning, or even a form. They can be used to show a modal, a dialog, or even a full-screen overlay. They are a great way to add a little extra to your site without taking up too much space. They can be used to show a message, a warning, or even a form. They can be used to show a modal, a dialog, or even a full-screen overlay. They are a great way to add a little extra to your site without taking up too much space.