img in front of text / value

[cdebackere]

OK, now I better understand the custom slider css better as well (uses before)

but I tried to define a custom style class, and it fails. In the CSS editor the '.item-value' is in red. I guess CSS does not allow the like the 'resurcive' style listing.

.BOimageText .item-control::before {
content : "/scada/resources/img/BOlistgrey.svg";
}

My apologies for my CSS ignorance if I ask stupid questions