Second attempt to better hide the popup overlay when not shown...

src/components/finder/Finder.tsx

@@ -143,7 +143,7 @@ const Finder: Component<Props> = (props) => {
           <TextField onChange={searchStringChangeHandler} />
         </Box>
       </Dialog>
-      <div class={style.ol_popup} ref={popupElement}>
+      <div class={style.ol_popup + ' ol_popup'} ref={popupElement}>
         <a
           href='#'
           onclick={popupCloseHandler}

src/components/finder/finder.css

@@ -1,3 +1,3 @@
-.ol-map .ol_popup {
+.ol-map > .ol_popup {
   visibility: hidden;
 }