looks great. tried the US presidents timeline and UK Coronavirus timeline. I feel the contrast is too low in the US timeline. both timelines look low-res pixel

looks great. tried the US presidents timeline and UK Coronavirus timeline. I feel the contrast is too low in the US timeline. both timelines look low-res pixelated on my hidpi phones. scrubbing on the bottom timelines runs janky on Chrome and Samsung Internet Browser on Pixel 5. also janky on Safari on iPhone 12 pro.