Control CSS of state text in history-graph to make it transparent or even hide it

[FlorianWilk]

I would like to change the CSS style of the status text in the history graph to make it more transparent or even hide it.
By status text I mean the text inside the graph (here "Normal" and "Closed" ), not the labelling on the left side.

For me it makes the graph much more confusing if I have "many" entities there and I would like to have it cleaner / without the text or make the text much more transparent.

I've been looking for a solution but could only find the option to change the status binary sensor colour / which I've already customised to my needs. If there is a solution, I'm sorry for starting this discussion, I really couldn't find it.