div.container {
  background-color: #ffa;
}
textarea.editor {
  width: 90%;
  margin-left: 5%;
  margin-right: 5%;
  box-shadow: 0.5em 0.5em 0.5em black;
}
body.dirty textarea.editor {
  border: 5px solid red;
}
body.dirty header h1 {
  color: red;
}
div.dialog span.error {
  color: red;
}