However, when the user hovers the mouse over the image, then we want the image to come into full focus with 100% opacity. The pseudo-element of the parent will then contain the semi-transparent background-color. Else, the users might find it hard to figure out where they are on the page. The number ranges between 0 and 1. If you’re interested in learning more about web-development, check out the Web Development Certification Training by Edureka. 2-You have needed the knowledge of HTML and CSS for creating background Image opacity with color overlay. With the help of CSS opacity or RBG color, We can easily add a transparent overlay background image.The opacity property allows specifying the transparency of an element.. CSS Opacity in Firefox, Safari, Chrome, Opera and IE9. The opacity property sets the opacity level for an element. The CSS3 property for transparency is opacity and it is a part of the W3C CSS3 recommendation. Setting Opacity of Images. What is the Average Salary of a Front End Developer? This is generally used as a background setting when there is cascading of elements, placed one above the other. when we apply background opacity property of CSS for an HTML element, then what happened. The opacity-level describes the transparency-level, where 1 is not transparent at all, 0.5 is 50% see-through, … Values closer to zero represent more transparency, the image will be very light in visibility. The opacity property specifies the image or text transparency. We are going to explore CSS color overlay and image overlay CSS.