SemanSemantic-UItic-UI/build/less/themes/packages/github/collections/message.overrides

.ui.info.message {
  background-image: linear-gradient(#D8EBF8, #D0E3EF);
  border: 1px solid #97C1DA;
  box-shadow: none;
}
.ui.error.message {
  background-image: linear-gradient(#F8D8D8, #EFD0D0);
  border: 1px solid #DA9797;
  box-shadow: none;
}
.ui.warning.message {
  background-image: linear-gradient(#FFE3C8, #F5DAC0);
  border: 1px solid #DCA874;
  box-shadow: none;
}
.ui.success.message {
}