Three silent CSS theming bugs that made a component ignore all overrides

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A developer building a themeable credit card component discovered three separate bugs that caused user-defined CSS custom properties to be silently ignored without any errors. The first issue stemmed from declaring default variable values directly on the component's root class, which overwrote any values inherited from ancestor elements. The second bug arose because the component's unlayered stylesheet outranked Tailwind v4's layer-based utilities in the CSS cascade, making utility-class overrides impossible regardless of specificity. A third problem involved a React wrapper that applied the className prop to a container div rather than the component's root element, compounding the first bug. The fix for the first two issues is to remove variable declarations from the component and instead place defaults as fallbacks inside var(), allowing any externally set value to take precedence.

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