Fixed positioning divs do not overlook the constraints of their parent div's width, height, or position

Incorporating a basic Vue.js app and aiming to introduce a component functioning as a popup. My usual method that has consistently produced results involves adding a div with the following CSS code:

.popupBg {
    position: fixed;
    top: 0;
    left: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 5;
    width: 100%;
    height: 100%;
}

The purpose of this div is to serve as a semi-transparent overlay background with another nested div acting as the actual container for the popup form.

After setting up a new Vue.js project recently and attempting to incorporate a similar popup setup with an overlay, I encountered an issue where the fixed div remains confined within one of its parent divs instead of stretching across the entire HTML page.

App:

HTML structure:

The overlay resides within a div featuring the class traitGenerator container medium, while the overlay itself is located in the div labeled traitSelector popupBg

I have followed the same process numerous times in past projects, making this particular situation perplexing. Shouldn't the key feature of position: fixed be to disregard other elements in the DOM? Where could my mistake lie?

Answer №1

The main container may contain the transform attribute. According to the information found in the documentation:

It is positioned relative to the initial containing block set by the viewport, except when a predecessor has a transform, perspective, or filter property defined as anything other than none (refer to the CSS Transforms Spec), at which point that ancestor will act as the containing element.

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