Add a background to v-tooltip related to things

[mcicolella]

When you move the mouse over a thing on the floorplan a tooltip shows some related data. We need to add a background to it (now it's transparent) to make the data more readable.

Rif. Environment component

[ubaldop]

@mcicolella I can work on this.

[amenak77]

Best color pairing could be white script on black background in my opinion

[ubaldop]

ok then,