On screen controls (sliders and text are displayed white on very light
grey transparent background. That is very hard to see.

Transparent background should be much darker, or maybe there could be an
option for user to set it on his own.

Also texts size on the controls is to small, and clickable areas are to
close to each other. There is lots of space on the screen but it is not
used. Instead, controls are small and to close together. It would be
good if text is bigger and clickable elements have more spacing.

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