diff --git a/src/overlay.js b/src/overlay.js
index 61f5fa88..36ea93a1 100644
--- a/src/overlay.js
+++ b/src/overlay.js
@@ -135,8 +135,12 @@
         if (this.element.id) {
             this.elementWrapper.id = "overlay-wrapper-" + this.element.id;
         } else {
-            this.elementWrapper.id = "overlay-wrapper";
+            this.elementWrapper.id = "overlay-wrapper-" + crypto.randomUUID(); // Ensure unique ID
         }
+        
+        // Always add a class for easier selection
+        this.elementWrapper.classList.add("openseadragon-overlay-wrapper");
+        
 
         this.style = this.elementWrapper.style;
         this._init(options);