When the content in the div exceeds its boundaries, it causes it to overlap with

In my design, I have a top menu with a z-index of 999 to ensure nothing covers it. However, I am facing an issue where a scrolling div is appearing on top of the menu bar even though it shouldn't. Any idea why this is happening?

Here is the CSS for the scrolling div:

.product-viewer {
    width: 85%;
    margin-left: 15%;
    display: inline-block;
    border-top-left-radius: 30px;
    border-bottom-left-radius: 30px;
    height: 300px;
    background-color: #202020;
    overflow-y: hidden;
    overflow-x: scroll;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
    z-index: 0;
}

The CSS for the menu bar (with additional styling when fixed in position):

#menu {
    width: 100%;
    height: 50px;
    background-color: rgba(0, 0, 0, 0.8);
    background-blend-mode: hard-light;
    text-align: center;
    overflow: hidden;
    line-height: 50px;
    display: inline-block;
}

#menu.fix {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 999;
}

For more information, visit:

htmlcsspositionoverflow

Answer №1

It seems that your .cover-image element has a z-index: 0 !important;, causing it to flow under the following element. The issue lies in your markup structure, as your menu is nested within .cover-image and the subsequent element .section.no-select lacks z-index definitions, allowing it to overlap the previous element.

To resolve this issue, simply adjust the z-index property like so:

.cover-image {
    height: 600px;
    height: calc(100vh - 15vmax);
    max-height: 75vh;
    z-index: 1 !important;
}

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