Variable DRAWING_TOOLBAR_CSSConst
DRAWING_TOOLBAR_CSS: "\n.oac-widget .oac-drawbar { position: absolute; z-index: 25; display: flex; align-items: center; gap: 2px; padding: 3px;\n background: var(--oac-panel); border: 1px solid var(--oac-bd); border-radius: 9px; box-shadow: var(--oac-shadow); }\n.oac-widget .oac-drawbar .oac-btn { height: 28px; }\n.oac-widget .oac-drawbar .oac-sep { height: 18px; margin: 0 3px; }\n.oac-widget .oac-drawbar__color { margin: 0 2px; }\n.oac-widget .oac-drawbar__width { min-width: 44px; padding: 0 7px; font-size: 11.5px; font-variant-numeric: tabular-nums; color: var(--oac-tx); }\n.oac-widget .oac-drawbar .is-mixed { color: var(--oac-mut); font-style: italic; }\n.oac-widget .oac-drawbar .oac-btn[aria-pressed=\"mixed\"] { border-color: var(--oac-on-bd); border-style: dashed; }\n.oac-widget.is-mobile .oac-drawbar { display: none; }\n/* The properties dialog edits the same selection in full; two surfaces for it would sit on each other. */\n.oac-widget:has(.oac-layer > .oac-props) .oac-drawbar { visibility: hidden; }\n" = ...
Append beside the shared widget styles when mounting the toolbar yourself.