Fixes theme background colors.

visualization-bundle/src/visualizers/grid-visualizer/GridVisualizer.tsx

@@ -78,6 +78,7 @@ export class DecoratedGridComponent extends React.Component<{
 
 		return (
 			<div
+				className="component-GridVisualizer"
 				style={{
 					height: "100%",
 					justifyContent: "center",

visualization-bundle/src/visualizers/grid-visualizer/style.scss

@@ -1,3 +1,6 @@
+.themeable {
+	--visualizer-grid-background: var(--visualizer-background);
+}
 .theme-dark {
 	--visualizer-grid-empty-foreground: #f0f0f0;
 }
@@ -5,6 +8,10 @@
 	--visualizer-grid-empty-foreground: #000000;
 }
 
+.component-GridVisualizer {
+	background-color: var(--visualizer-grid-background);
+}
+
 .component-Grid {
 	.part-data {
 		border: 1px solid lightgray;