message: Add white background to mermaid divs
diff: img {
  margin: .3rem !important;
  }
  +
  +/* Insert white background rectangle for mermaid divs, so they are visible in dark theme */
  +body[data-theme="dark"] .mermaid
  +{
  + background-color: #ffffff
  +}
  \ No newline at end of file
  