z-index Not Working: Understanding and Resolving Positioning Issues
When working with multiple elements positioned using z-index, it's possible to encounter situations where the expected layering doesn't occur. One such issue arises when attempting to place an element behind another that has been positioned using z-index.
In the provided code, two rings are created: the first, positioned on top of the circle without the top, and the second, behind the circle. The latter, despite having a z-index value of -3, remains in front due to the transform property applied to it.
The solution lies in removing the transform property and replacing it with an alternative. Here's the modified code:
:root{<br> --size:200px;<br>}</p><h1 id="background">background {</h1><p>width:100%;<br> height:100%;<br> position:absolute;<br> top:0;<br> left:0;<br> background: linear-gradient(-23.5deg, #000033, #00001a);<br> z-index:-2;<br>}</p><h1 id="background-mainplanet">background #mainplanet {</h1><p>width:var(--size);<br> height:var(--size);<br> background:#fff;<br> position:relative;<br> top:calc(50% - var(--size)/2);<br> left:calc(50% - var(--size)/2);<br> border-radius:50%;<br>}</p><h1 id="background-mainplanet-before-background-mainplanet-after">background #mainplanet:before,#background #mainplanet:after{</h1><p>content:"";<br> width:calc(var(--size) * 1.5);<br> height:calc(var(--size) / 2);<br> border:30px solid #000;<br> position:absolute;<br> top:10px;<br> left:-80px;<br> border-radius:50%;<br> transform: rotateX(66deg) rotateY(170deg);<br>}</p><h1 id="background-mainplanet-before">background #mainplanet:before{</h1><p>border-top-color:transparent;<br>}</p><h1 id="background-mainplanet-after">background #mainplanet:after{</h1><p>z-index:-3;<br>}
<div id="background"><br> <div id="mainplanet"><br> </div><br></div>
With this modification, the second ring is now correctly positioned behind the circle, showcasing the effectiveness of using z-index to manipulate object layering.
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