append sidebar -- less likely to throw off ranges

hypothesis/js/src/hypothesis.coffee

@@ -35,7 +35,7 @@ class Hypothesis extends Annotator
     @heatmap.element.appendTo(@sidebar)
     @viewer.element.appendTo(@sidebar)
     @editor.element.appendTo(@sidebar)
-    @sidebar.prependTo(@wrapper)
+    @sidebar.appendTo(@wrapper)
 
     @plugins.Auth.withToken (token) =>
       @plugins.Permissions.setUser token.userId

hypothesis/sass/app.scss

@@ -140,6 +140,7 @@ $iconset: iconset_wireframe;
   height: 100%;
   line-height: $line-height / $em * .8;
   position: absolute;
+  top: 0;
   left: 100%;
   z-index: 500;