Alacritty with a rainbow border via an "oklch longer hue" gradient.
https://files.mastodon.online/media_attachments/files/112/795/085/931/611/878/original/10b3d4f948c425b9.png
One of the niri users has contributed a gradient interpolation color space setting! Now you can do pretty gradient borders in srgb-linear, oklab and oklch (in all four hue directions).
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