Adobe (who works on the spec for this stuff) created this Pen for playing with the different possiblities here. This is where you can specify your transition properties and the overlay color: Multiply is a nice and useful one, but there is also: screen, overlay, darken, lighten, color-dodge, color-burn, hard-light, soft-light, difference, exclusion, hue, saturation, color, and luminosity. The most important CSS class, like the HTML, is the overlay-effect. In addition to the "overlay-effect" class, you can see the classes "h-100" and "w-100" which are used to specify that the box should stretch 100% in all directions. The key ingredients Here’s what we’re working with under the hood: SVG turbulence: This is our noise filter. This is an empty div that will essentially become our image overlay. Layer it underneath a gradient, boost the brightness and contrast, and that’s it you have gradient that gradually dithers away. Of particular note is the "overlay-effect" div. The HTML is rather straightforward with existing Bootstrap 4 classes. box-shadow: inset 0 0 0 1000px rgba (0,0,0.2) There are a surprising number of uses for the box-shadow feature. This one is pure CSS, and doesn't require any extra HTML. This tutorial walks you through a simple way to add a bit more life into a potentially boring page. 19 Answers Sorted by: 447 I know this is a really old thread, but it shows up at the top in Google, so here's another option. Not only does it give your website a bit more visual complexity, but it can also help web users to identify which choice they're about to make. So the question becomes "how do you add hover effects to image links?" Color overlays are some of the most popular visual effects that you can add to your website and which create the hover effects you want. Web accessibility guidelines dictate that links need to have some distinction so that users can accurately measure where they are on a page. This isn't just about design and user exerpience, however. This can be problematic from an UI perspective because users ultimately need that visual indication that (1) there's a link and (2) they're hovering over it. Unlike text links, however, there's no standard "hover" effect when it comes to an image. A traditional problem many face is that they want to use images in conjunction with links or various onclick events.
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