Try darker bottom border color for input fields. #8037
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Description
This PR seeks to explore an improved color contrast ratio for input fields as discussed in #7053, by making the bottom border color use a darker gray.
Ideally, all form elements should have at least a contrast ratio of 3:1 with the adjacent background. See:
https://www.w3.org/TR/WCAG21/#non-text-contrast
https://www.w3.org/WAI/WCAG21/Understanding/non-text-contrast.html
Of course, this applies to the controls themselves (e.g. their borders). Text still needs a contrast ratio of 4.5:1.
Other form elements, for example radio buttons, checkboxes, and selects, should be discussed and addressed separately.