The z-index property can be specified with an integer value (positive, zero, or negative), which represents the position of the element along the z-axis. And the modal is a child element of the content element.Because the modal is inside the content element, its So its children, including the modal, can’t break out of that (You can remember it with this slightly depressing metaphor: a child can be limited by its parents, and can’t break free of them. That means that if an element is contained in a stacking context at the bottom of the stacking order, there is no way to get it to appear in front of another element in a different stacking context that is higher in the stacking order, even with a z-index of a billion!New stacking contexts can be formed on an element in one of three ways:The first and second ways to form stacking context make a lot of sense and are generally understood by Web developers (even if they don’t know what they’re called).The third way (opacity) is almost never mentioned outside of w3c specification documents.Actually determining the global stacking order for all elements on a page (including borders, backgrounds, text nodes, etc.) CSS Level 2 (Revision 1) The definition of 'z-index' in that specification. (You can read more of the stacking order guidelines at Mozilla Developer Network In our example with the cats and the white block, they are obeying this rule. I have tried using CSS styles to control the z-index property, but still no luck - the slideshow still obscures the flyout panels. Our mission: to help people learn to code for free. To accomplish this, we’ll add But this causes the bottom cat to be displayed on top of the white block again!You may not run into this issue often, but another aspect of stacking order is that some CSS properties like In my opinion, doing this will solve most, if not all of the more basic z-index issues.Here’s what we have: a simple webpage with regular content, and a pink side tab that says “Send Feedback” that is positioned on top of the content.Then, when you click on the photo of the cat, a modal window with a transparent gray background overlay opens up.However, even when the modal window is open, the side tab is still on top of the gray overlay. According to this rule, elements that come later in the markup will be on top of elements that come before them. I'm making a course that will teach you how to build a real-world responsive website from scratch! To sum up, most issues with z-index can be solved by following these two guidelines:I write tips for beginner web developers at Coder-Coder.com. freeCodeCamp is a donor-supported tax-exempt 501(c)(3) nonprofit organization (United States Federal Big Data QA Tester Engineer role extends to different domains when the organization chooses to change a little and get better itself to an improved technology. We also have Note: z-index only works on positioned elements (position: absolute, position: relative, position: fixed, or position: sticky). The z-index property in CSS controls the vertical stacking order of elements that overlap.
Elements can overlap for a variety of reasons, for instance, relative positioning has nudged it over something else. (OK, it’s actually a When you introduce the position property into the mix, any positioned elements (and their children) are displayed in front of any non-positioned elements. Here’s “Also note that nesting plays a big role. Z-index is a CSS property that allows you to position HTML elements in layers on top of one another.
To sum up, most issues with z-index can be solved by following these two guidelines: Still I am not so clear about it. And the modal is a child element of the content element.Because the modal is inside the content element, its So its children, including the modal, can’t break out of that (You can remember it with this slightly depressing metaphor: a child can be limited by its parents, and can’t break free of them. It just come over the menu.