When using hovermode "x unified", the tooltip box covers the graph right at the spot the mouse cursor points at.

[StackedCrooked]

As you can see, the tooltip box covers the vertical dotted line and the datapoints in the lines that are being highlighted.

[StackedCrooked]

Apologies. It was caused by a css override in our code.

[StackedCrooked]

That said, it would be nice to have more options for positioning and configuring margin/padding of the tooltip box.