* {
  engine: none;
  border-radius: 0;
  border-style: none;
  border-image: none;
  background-image: none;
}

GtkWindow {
  background-color: green;
}

GtkButton {
  background-color: black;
  border-style: solid;
  border-color: rgba(255,0,0,0.6);
  border-width: 4;
}

#reference {
  border-color: rgb(153,102,0);
}