iridium-c/src/iridium.css

GtkSourceView {
  font-family: "Fira Mono", monospace;
  font-size: 1.05em;
}

GtkEntry {
  border: none;
  background: none;
  font-size: x-large;
  font-weight: bold;
}

GtkPaned {
  background-color: white;
}