Utilization of z-index with float: left within an image gallery in CSS

Currently, I am working on an image gallery that has content generated randomly. In terms of CSS, the images are positioned using the following code:

.item {
  width: 200px;
  margin: 10px;
  float: left;
}

To add some functionality, I have implemented JQuery to select one image from the gallery at random and double its length using .addClass along with the accompanying CSS:

.frontpageimagelong {
    height: 200px;
    width: 420px;
}

However, I encountered a problem where the longer image ends up being hidden under the next image in line instead of covering it. I am looking for a solution to make the extended image appear above the following image.

My initial thought was to utilize Z-Index like so:

.item {
  width: 200px;
  margin: 10px;
  float: left;
  position: relative;
  z-index: 1;
}

.frontpageimagelong {
height: 200px;
width: 420px;
position: relative;
z-index: 99;
}

Unfortunately, this approach did not yield the desired result. If anyone has any suggestions or solutions on how to tackle this issue effectively, I would greatly appreciate it. Thank you.

EDIT: Included an image depicting the problem:

Answer №1

I want to express my gratitude for the assistance I received. While the issue was not completely resolved, I managed to find a workaround solution. By utilizing JQuery, I was able to locate the image positioned next to the longimage and then proceeded to remove it using JQ as well. As a result, the .item div remains intact but now without an image, rendering it invisible.

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