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;
  background: white;
  font-family: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas,
    "DejaVu Sans Mono", monospace;
  font-weight: normal;
  font-size: 1.3rem;
  text-align: initial;
}

.Editor-textarea,
.Editor-underlay {
  font-family: inherit;
  font-weight: inherit;
  font-size: inherit;
  padding: 5px;
  box-sizing: border-box;
  margin: 0;
  line-height: normal;
}

.Editor-textarea {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  border: none;
  background-color: transparent;
  resize: none;
  outline: none;
}

.Editor-underlay {
  width: 100%;
  height: 100%;
  pointer-events: none;
  color: transparent;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-y: scroll;

  .highlighted {
    background: #ffff00;
  }
}