diff --git a/src/overlay.js b/src/overlay.js
index f231e644..add325a8 100644
--- a/src/overlay.js
+++ b/src/overlay.js
@@ -133,10 +133,11 @@
         this.elementWrapper.appendChild(this.element);
 
         if (this.element.id) {
-        this.elementWrapper.id = "overlay-wrapper-" + this.element.id;
-        } else {
-        this.elementWrapper.id = "overlay-wrapper-" + crypto.randomUUID(); // Ensure unique ID
-        }
+    this.elementWrapper.id = "overlay-wrapper-" + this.element.id; // Unique ID if element has one
+}
+// Always add a class for styling & selection
+    this.elementWrapper.classList.add("openseadragon-overlay-wrapper");
+
 
         // Always add a class for easier selection
         this.elementWrapper.classList.add("openseadragon-overlay-wrapper");