Why do certain list items on my page have a gap between their border and content?

I recently encountered an issue with my list of items and their styling. Each list item contains an anchor element with a gray background, while the item itself has a gradient bottom border.

However, I noticed that in some cases, there was a white line appearing between certain items. After investigating, I discovered that this was due to the list item's background 'shining through' the anchor label. Why does this happen?

Interestingly, this issue seems to be prevented when the anchor text doesn't wrap, or when the bottom border has an even thickness (2px, 4px, etc).

Although I could simply hide the effect by setting the background color on the item itself, I'm more curious about why this phenomenon occurs rather than just how to solve it.

https://i.sstatic.net/6PdiB.png

For a visual demonstration of this issue, you can check out this codesandbox link.

html css

Answer №1

You may have encountered a common issue in web design.

When the system attempts to convert CSS pixels into the multiple screen pixels that make up one CSS pixel on modern screens, problems can arise.

Occasionally, a single screen pixel may be left behind, resulting in a thin line or anomaly.

This issue is akin to a rounding error and often becomes noticeable when zooming in or out at specific levels.

The fact that you are observing this at 1px sizing confirms my suspicion that this is indeed the underlying problem.

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