libratbag/libratbag#422 introduced effect duration in ms for LEDs as opposed to
effect rate in Hz, as was discussed in #175. This commit updates Piper's
UI to reflect these changes.
Fixes#175.
Ah, what a beautiful night sky...
The CSS background taken from the control-center scroll test page. Apparently
we can't use the SVG background and have to do this manually.
Fixes#45