So, if the overlay is contained in another div for example and that other div has a position set to relative, then the overlay will be positioned absolutely with respect to its container, not the page body. The code is very simple, but there are a few things to be aware of when using this technique.įirst, you need to make sure that the overlay is positioned absolutely with respect to the body. overlay, the CSS to position this overlay on the page is:īackground-color: rgba(0,0,0,0.5) /*dim the background*/ Supposing we have already added an empty div to the markup and given it a class. There would be an empty div in the markup, and with CSS this div is positioned absolutely and given a high z-index value to make sure it stays on top of all other elements on the page, except the modal which is opened on top of this overlay, which will get a even higher z-index than the overlay. The first way that an overlay can be created is by absolutely positioning an HTML element on the page. Technique #1: Absolutely positioned element The aim of this tutorial is to introduce you to several techniques that can be used to create this dimmed overlay with CSS, and determine the pros and cons of each technique as we go over them. When the user interaction is only accepted in the pop-up modal, a Lightbox effect is usually applied and the rest of the page is dimmed, indicating its inactivity. They can be activated directly by user events (e.g., clicking on an action, hovering over objects) or be provided by the web application at various stages in the completion of an action.” - Designing Web Interfaces Lightweight overlays can be used for asking questions, obtaining input, introducing features, indicating progress, giving instructions, or revealing information. This lightweight layer is what we call an overlay. One way to keep the user on the same page is by trying to include some of the experiences in the context of the current page, by displaying a “mini page”, or a pop-up dialog, in a lightweight layer over the current page. We can decide intelligently when to keep the user on the page and model his process. This principle is based on the fact that page refreshes are disruptive to the user’s mental flow, causing what is known as “ change blindness”, and that we need to be able to avoid breaking the visual flow of the user wherever and whenever we can. One of these design principles is the “Stay On Page” principle. Design patterns, a set of best practices and techniques that aim to solve some of the most common design “problems”, are usually presented in the context of design principles.
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