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

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


.jp-Help {
  min-width: 480px;
  background: white;
}


.jp-Help::before {
    content: '';
    display: block;
    height: var(--jp-toolbar-micro-height);
    background: var(--jp-toolbar-background);
    border-bottom: 1px solid var(--jp-toolbar-border-color);
    box-shadow: var(--jp-toolbar-box-shadow);
    z-index: 1;
}


.jp-Help > iframe {
  border: none;
}