[data-swatch]::before {
  background-color: rgba(var(--text-color) / 0.08);
}

[data-swatch="nero"]:before { background-color:#000000}[data-swatch="rosso"]:before { background-color:#f10323}[data-swatch="blu"]:before { background-color:#26316b}[data-swatch="azzurro"]:before { background-color:#0366cc}[data-swatch="green"]:before { background-color:#008b68}