In Paragon 7, Input controls use #b9babe (light gray) for border colors, which has 1.93:1 luminance contrast vs. white. Please use a darker gray for borders, one that will have minimum 3:1 contrast on any of the lightly tinted backgrounds in Paragon. I suggest #898989, as that seems to work (particularly for the pink background, which is hardest).
The goal of this WCAG 2.1 guideline is to make interactive elements noticeable for low-vision users. See https://www.w3.org/WAI/WCAG21/Understanding/non-text-contrast.html for details