Fix for dark theme, class diagrams (v2)

src/diagrams/class/classRenderer-v2.js

@@ -457,7 +457,7 @@ export const draw = function (text, id) {
       rect.setAttribute('ry', 0);
       rect.setAttribute('width', dim.width);
       rect.setAttribute('height', dim.height);
-      rect.setAttribute('style', 'fill:#e8e8e8;');
+      // rect.setAttribute('style', 'fill:#e8e8e8;');
 
       label.insertBefore(rect, label.firstChild);
     }

src/diagrams/class/styles.js

@@ -12,6 +12,19 @@ const getStyles = (options) =>
 
 }
 
+.nodeLabel, .edgeLabel {
+  color: ${options.classText};
+}
+.edgeLabel .label rect {
+  fill: ${options.mainBkg};
+}
+.label text {
+  fill: ${options.classText};
+}
+.edgeLabel .label span {
+  background: ${options.mainBkg};
+}
+
 .classTitle {
   font-weight: bolder;
 }