jupyterlab/packages/debugger/style/editor.css

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

.jp-DebuggerEditor-highlight {
  text-shadow: 0 0 1px var(--jp-layout-color0);
  outline: 1px solid;
}

body[data-jp-theme-light='false'] .jp-DebuggerEditor-highlight {
  background-color: var(--md-brown-800);
  outline-color: var(--md-brown-600);
}

body[data-jp-theme-light='true'] .jp-DebuggerEditor-highlight {
  background-color: var(--md-brown-100);
  outline-color: var(--md-brown-300);
}

.jp-DebuggerEditor-marker {
  position: absolute;
  left: -34px;
  top: -1px;
  color: var(--jp-error-color1);
}