diff --git a/packages/mermaid/src/diagrams/flowchart/styles.ts b/packages/mermaid/src/diagrams/flowchart/styles.ts
index 491ed291b..9be910932 100644
--- a/packages/mermaid/src/diagrams/flowchart/styles.ts
+++ b/packages/mermaid/src/diagrams/flowchart/styles.ts
@@ -165,10 +165,17 @@ const getStyles = (options: FlowChartStyleOptions) =>
   }
 
   .icon-shape {
+    background-color: ${options.edgeLabelBackground};
     p {
       background-color: ${options.edgeLabelBackground};
       padding: 2px;
     }
+    rect {
+      opacity: 0.5;
+      background-color: ${options.edgeLabelBackground};
+      fill: ${options.edgeLabelBackground};
+    }
+    text-align: center;
   }
 `;