Why Does Content Extend Beyond a Container with Border-Radius?

Explaining the Behavior of Border-Radius Clipping

The question arises: why does the content extend beyond the container when border-radius is applied?

Understanding Default Overflow Behavior

By default, most elements, including divs, have visible overflow. This means that content is not clipped and can extend beyond the element's bounds.

Border-Radius Corner Clipping

The CSS Backgrounds and Borders module specifies that the border clip is applied to the backgrounds of an element, but not its border-image. However, the module also emphasizes that effects that clip to the padding or border edge, such as overflow other than visible, must also clip to the curve.

Implications for Content Clipping

Therefore, for the corners of the border-radius to clip the content, the overflow value of the container must be something other than visible. This includes overflow: auto, hidden, scroll, and others that limit content display.

Resolving the Issue

To clip the content within the rounded corners, one must modify the container's style to include overflow: hidden. This ensures that the content remains within the container's bounds, even with the applied border-radius.

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