Engine settings slider handle opacity

[pnodet]

The slider handles are see-through with the content under the pop-over.

It's hard to explain but hopefully easier to understand with the screenshot below.
You can see here the e1 from the move list under the pop over in the handle.

Same behavior with the other handles but not shown here.

[randompearl-stack]

I could reproduce the issue on the latest Safari. Interestingly, you can only see through the slider if the computer analysis is turned on and the board is on that move. If you open the opening explorer you can also see that through the slider.

[Chapman808]

I'm not a UI person by any measure, but it seems like a compatability issue with thewebkit slider element ,'webkit-slider-runnable-track'.

https://developer.mozilla.org/en-US/docs/Web/CSS/::-webkit-slider-runnable-track

According to the mozilla doc, this element is not supported by Safari.