jupyterlab/packages/terminal/style/base.css

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

.jp-Terminal {
  min-width: 240px;
  min-height: 120px;
}

.jp-Terminal-body {
  padding: 8px;
}

[data-jp-theme-light='true'] .xterm .xterm-screen canvas {
  border: 1px solid white;
}

[data-jp-theme-light='false'] .xterm .xterm-screen canvas {
  border: 1px solid black;
}