Rocket/examples/todo/static/css/style.css

.field-error {
  border: 1px solid #ff0000 !important;
}

.field-error-msg {
  color: #ff0000;
  display: block;
  margin: -10px 0 10px 0;
}

.field-success {
  border: 1px solid #5AB953 !important;
}

.field-success-msg {
  color: #5AB953;
  display: block;
  margin: -10px 0 10px 0;
}

span.completed {
    text-decoration: line-through;
}