Stirling-PDF/src/main/resources/static/dark-mode.css

/* Dark Mode Styles */
body {
    background-color: #333;
    color: #fff;
}

.dark-card {
  background-color: #333 !important;
  color: white;
}
.jumbotron {
  background-color: #222; /* or any other dark color */
  color: #fff; /* or any other light color */
}