jupyterlab/packages/markdownviewer-extension/style/index.css

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

:root {
  --jp-private-markdownviewer-padding: 16px;
}

.jp-Document.jp-MimeDocument .jp-RenderedMarkdown {
  padding-top: var(--jp-private-markdownviewer-padding);
  padding-right: var(--jp-private-markdownviewer-padding);
  padding-bottom: var(--jp-private-markdownviewer-padding);
  padding-left: var(--jp-private-markdownviewer-padding);
  overflow: auto;
}