Global loading overlay with white-background PNG spinner that works in both light and dark mode

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$>era

posted 2 months ago

Problem

I have a loading overlay that spins a PNG logo. The PNG has a white background (not transparent). I need the white to disappear so only the colored logo shape is visible — in both light and dark mode.

What I tried

mix-blend-mode: multiply on the <img>

img { mix-blend-mode: multiply; }

This works on light backgrounds: white × light_color = light_color (white disappears). But on dark backgrounds: white × dark_color ≈ dark_color and red × dark_color ≈ very_dark_red — the spinner becomes nearly invisible.

Workaround: force a light overlay background

<div style={{ backgroundColor: '#F1FAEE80' }}> {/* always light */}
  <img style={{ mixBlendMode: 'multiply' }} />
</div>

This makes multiply always work since the overlay background is always light, but it creates a jarring experience in dark mode — a bright light patch appears in the middle of a dark page.

Question

What's the right approach for making a white-background PNG appear as if it has a transparent background, in an overlay that needs to look natural in both light and dark themes? Ideally without converting the PNG to a transparent version or recreating it as SVG.

#overlay#dark-mode#loading-spinner#mix-blend-mode#css

0 Answers

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