/* Force dark text inside Mermaid diagram nodes regardless of the
   active colour scheme. Material's slate (dark) theme otherwise sets
   the node label colour to a light value, which is invisible against
   the light default node fill. */
.mermaid .nodeLabel,
.mermaid .node .label,
.mermaid .node text,
.mermaid .node span {
  color: #000 !important;
  fill: #000 !important;
}