app-specific.css

.entry.error, .entry.error:focus {
  color: #FF7777;
  background-color: mix(@theme_bg_color, red, 0.1);
  border-color: red;
}

.entry.error:selected {
  color: #FFEE99;
  background-color: mix(@theme_bg_color, yellow, 0.2);
}