theme.css

svg { background:var(--vscode-editor-background) }

#shadows { display:none }

.state rect.body {
    stroke:var(--vscode-editor-foreground);
    fill:  var(--vscode-editor-selectionHighlightBackground);
}
.state.containmentError rect.body {
    stroke:var(--vscode-editorError-foreground);
}

svg text {
    fill:var(--vscode-editor-foreground);
    opacity:0.65;
}

#selectors > * {
    fill:  var(--vscode-button-background);
    stroke: var(--vscode-editor-background);
}
#selectors > *:hover {
    fill:  var(--vscode-button-hoverBackground);
}

.selected text { fill:var() }
.state.selected rect.body {
    fill: var(--vscode-editor-selectionBackground, var(--vscode-editor-wordHighlightStrongBackground));
}

.state .enter,
.state .exit { stroke:var(--vscode-editor-foreground) }
path.line { stroke:var(--vscode-editor-foreground) }

#guides line { stroke:var(--vscode-editorIndentGuide-background) }

body.vscode-dark #inspector { background:#222; border-color:rgba(255,255,255,0.5); color:#ccc }
body.vscode-dark #inspector tr > * { border-top-color:#333 }
body.vscode-dark #inspector #transProperties tr:first-child > * { border-top-color:#666 }
body.vscode-dark #inspector th { color:#999 }
body.vscode-dark #inspector table { background:#444 }

/* SVG Markers */
#source circle,
#target-actions polygon,
#target polygon,
#targetless circle { fill:var(--vscode-editor-foreground) }
#target-actions path { stroke:var(--vscode-editor-foreground) }
#source-conditional > circle { fill:var(--vscode-editor-findMatchHighlightBackground); stroke:white }
#source-conditional-error > circle { fill:var(--vscode-editor-findMatchHighlightBackground); stroke:var(--vscode-editorError-foreground, var(--vscode-debugExceptionWidget-border)) }
#source-error > circle { fill:var(--vscode-editorError-foreground, var(--vscode-debugExceptionWidget-border)); opacity:1 }
#target-actions-error > path { stroke:var(--vscode-editorError-foreground, var(--vscode-debugExceptionWidget-border)) }
#target-error > polygon,
#target-actions-error > polygon { fill:var(--vscode-editorError-foreground, var(--vscode-debugExceptionWidget-border)) }
#targetless-actions > circle { stroke:var(--vscode-editor-foreground) }
#targetless-error > circle,
#targetless-actions-error > circle { stroke:var(--vscode-editorError-foreground, var(--vscode-debugExceptionWidget-border)) }

.transition.selected path.catcher { stroke:var(--vscode-editor-selectionBackground, var(--vscode-editor-wordHighlightStrongBackground)); }
.transition.targetless.selected path.catcher { fill:var(--vscode-editor-selectionBackground, var(--vscode-editor-wordHighlightStrongBackground)); }

body.vscode-dark .state.parallel .parallel-divider,
body.vscode-dark .state.parallel-child .parallel-divider { stroke:white }