jupyterlab/style/breakpoints.css

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

.jp-DebuggerBreakpoints-body {
  padding: 10px;
}

.jp-breakpoint-marker {
  position: absolute;
  left: -35px;
  top: -1px;
  color: #f22;
}