Inaccessibility: Low contrast in images with transparency in dark mode

[ruthmoog]

In dark mode, images with transparency do not have good contrast:

example image from https://www.a11yproject.com/posts/large-touch-targets/

<img src="/img/posts/large-touch-targets/touch-target-padding.svg" alt="A translate button with a square purple area surrounding it. The button is labeled, &quot;Button, 32 CSS pixels. The purple area is labeled, &quot;Interactive area, 44 CSS pixels.&quot;">