Fix first annotation not clickable

Fixes #1231

Author: wojtekmaj

src/Page/TextLayer.css

@@ -37,7 +37,6 @@
   white-space: pre;
   cursor: text;
   transform-origin: 0% 0%;
-  z-index: 1;
 }
 
 /* Only necessary in Google Chrome, see issue 14205, and most unfortunately
@@ -86,7 +85,7 @@
   top: 100%;
   right: 0;
   bottom: 0;
-  z-index: 0;
+  z-index: -1;
   cursor: default;
   user-select: none;
 }