jupyterlab/packages/markdownwidget/style/index.css

/*-----------------------------------------------------------------------------
| Copyright (c) Jupyter Development Team.
| Distributed under the terms of the Modified BSD License.
|----------------------------------------------------------------------------*/

.jp-MarkdownWidget {
  border-top: var(--jp-border-width) solid var(--jp-border-color2);
  padding: 14px;
  outline: none;
  overflow: auto;
}