fix: single block bg color

src/main/frontend/components/whiteboard.css

@@ -90,7 +90,6 @@ h1.title.whiteboard-dashboard-title {
 
 .single-block > :is(.block-content-wrapper, .editor-wrapper) {
   width: 100% !important;
-  background-color: var(--ls-secondary-background-color);
   padding: 8px 12px;
   border-radius: 8px;
 }