organic_ast_explorer/src/Editor.css

.Editor {
  display: flex;
  flex-direction: row;
  height: 100%;
  width: 100%;
}

.Editor-textwrapper {
  flex: 1;
  flex-basis: 0;
  position: relative;
}

.Editor-textarea {
  width: 100%;
  height: 100%;
}

.Editor-ast {
  flex: 1;
  background: green;
}

.Editor-overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  pointer-events: none;
}