jupyterlab/packages/vega4-extension/style/base.css

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

.jp-RenderedVegaCommon4 {
  margin-left: 8px;
  margin-top: 8px;
}

.jp-MimeDocument .jp-RenderedVegaCommon4 {
  padding: 16px;
}

.vega canvas {
  background: var(--jp-vega-background);
}