message: update doc style
diff: -.doc-md {
  - code {
  - margin: 0 1px;
  - padding: 0.2em 0.4em;
  - font-size: 0.9em;
  - background: #f0f5ff;
  - border: 1px solid #d8e3fb;
  - border-radius: 3px;
  - color: #668cdc;
  - }
  -
  +.article {
  .doc-viewer {
  - margin-bottom: 40px;
  -
  .editor-wrapper {
  height: 41px;
  overflow: hidden;
  