.container {
  display: flex;
  height: 100vh;
}

.editor {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.editor textarea {
  flex: 1;
  padding: 10px;
  margin: 5px;
  border: none;
  resize: none;
}

.preview {
  flex: 1;
  border: 1px solid #ccc;
}

.preview iframe {
  width: 100%;
  height: 100%;
  border: none;
}