![]() ![]() The rgb portion of rgba, represents, red, green and blue color channel values, while a represents the alpha channel, which is responsible for transparency.įor the alpha channel, a value of 1 creates an opaque color, while 0 creates a fully transparent color.īy assigning a value between 0 and 1 to the alpha channel of the rgba color value of the box shadow, you can create a semi-transparent overlay. This can be done by using the rgba() function for shadow color. Since overlays usually have some transparency, you need to add it to the box shadow as well. The box-shadow has a property value called inset, which causes the shadow to appear inwards of the frame of the box.Īn inset box-shadow with a shadow size half or more than half of the width and height of the element, creates a shadow that covers the entire element. The box-shadow is perfect for this job, since what is an overlay but a dark shadow cast over an element? So how can you actually create a CSS-only overlay? With the help of the box-shadow CSS property. Read Also: How to Optimize CSS with Code Style Guides Create Overlay with box-shadow To keep your code in order, and not to mess your HTML outline up, it’s a better choice to use a CSS-only solution. However having separate style rules for elements & their overlays still harms CSS readability and maintainability. If you aren’t an HTML size pedantic, having an extra element for overlay is probably not a big deal, as most likely it won’t tax the bandwidth of any network that much. The problem is that this technique involves the usage of an extra element (or pseudo-element) for the overlay. Overlays are frequently created by positioning an extra HTML element with an opacity value less than 1 right above the element to be covered. ![]() See the Pen Colored Overlay Using Box-Shadow by Preethi on CodePen. ![]() Read Also: 18 Amazing Effects You can Create with CSS3 Box Shadows Although this post discusses images, the technique it presents can be safely applied to other content types (such as text blocks) as well. Hover the images to make the overlays reveal the pokemons. You can see the final result on the demo below. In this article, we’ll have a look at how to add colored overlay to images by using pure CSS. After the interaction (clicking or hovering) occurs, the overlay gets removed and reveals the content beneath it. They help you hide an element on a web page, and later – with the user’s approval – reveal it, and display extra information or controls, such as buttons behind it.Ī typical overlay is semi-transparent, with a solid background color (usually black), and there’s some text or buttons on it for users to see or interact with. Content overlays are a prominent part of modern web design. ![]()
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