Why is the `linear-gradient` background disappearing when using `position: absolute` on the header?

Position Absolute Breaks Linear-Gradient: Solving the Enigma

In an attempt to centralize a header within a web page that effortlessly adapts to diverse viewport resolutions, a developer implemented an absolute positioning strategy. However, this seemingly straightforward solution presented an unexpected quandary: the linear-gradient background seemingly vanished.

Upon investigation, the developer noticed that the gradient background appeared pristine when the header element was removed from the CSS code. This enigmatic phenomenon suggested that the issue arose from the interaction between the absolute positioning and the background gradient.

Delving deeper into the CSS specification, it became evident that absolute positioning removes an element from the flow of the document, effectively creating a new stacking context. As a result, the background gradient applied to the body element was no longer visible beneath the absolutely positioned header element.

To rectify this, a simple yet effective solution was implemented: adding a minimum height to the body element. This ensured that the background gradient had sufficient space to be displayed, enabling it to appear beneath the header element without disruption. Thus, the elusive gradient was restored while the header element remained perfectly centralized.

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