Move annotation related CSS rules from pdf_viewer.css to its own file

This is similar to the already existing, separate, CSS file used for the `textLayer`, and it's necessary in order for the `pageviewer` components example to actually show annotations correctly.

web/annotations_layer_builder.css

@@ -0,0 +1,65 @@
+/* Copyright 2014 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+.annotationLayer .annotLink > a:hover {
+  opacity: 0.2;
+  background: #ff0;
+  box-shadow: 0px 2px 10px #ff0;
+}
+
+.annotationLayer .annotText > img {
+  position: absolute;
+  cursor: pointer;
+}
+
+.annotationLayer .annotTextContentWrapper {
+  position: absolute;
+  width: 20em;
+}
+
+.annotationLayer .annotTextContent {
+  z-index: 200;
+  float: left;
+  max-width: 20em;
+  background-color: #FFFF99;
+  box-shadow: 0px 2px 5px #333;
+  border-radius: 2px;
+  padding: 0.6em;
+  cursor: pointer;
+}
+
+.annotationLayer .annotTextContent > h1 {
+  font-size: 1em;
+  border-bottom: 1px solid #000000;
+  padding-bottom: 0.2em;
+}
+
+.annotationLayer .annotTextContent > p {
+  padding-top: 0.2em;
+}
+
+.annotationLayer .annotLink > a {
+  position: absolute;
+  font-size: 1em;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+}
+
+.annotationLayer .annotLink > a /* -ms-a */  {
+  background: url("data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAA\
+                   LAAAAAABAAEAAAIBRAA7") 0 0 repeat;
+}

web/pdf_viewer.css

@@ -13,6 +13,7 @@
  * limitations under the License.
  */
 @import url(text_layer_builder.css);
+@import url(annotations_layer_builder.css);
 
 .pdfViewer .canvasWrapper {
   overflow: hidden;
@@ -51,12 +52,6 @@
   background: url('images/loading-icon.gif') center no-repeat;
 }
 
-.pdfViewer .page .annotLink > a:hover {
-  opacity: 0.2;
-  background: #ff0;
-  box-shadow: 0px 2px 10px #ff0;
-}
-
 .pdfPresentationMode:-webkit-full-screen .pdfViewer .page {
   margin-bottom: 100%;
   border: 0;
@@ -76,48 +71,3 @@
   margin-bottom: 100%;
   border: 0;
 }
-
-.pdfViewer .page .annotText > img {
-  position: absolute;
-  cursor: pointer;
-}
-
-.pdfViewer .page .annotTextContentWrapper {
-  position: absolute;
-  width: 20em;
-}
-
-.pdfViewer .page .annotTextContent {
-  z-index: 200;
-  float: left;
-  max-width: 20em;
-  background-color: #FFFF99;
-  box-shadow: 0px 2px 5px #333;
-  border-radius: 2px;
-  padding: 0.6em;
-  cursor: pointer;
-}
-
-.pdfViewer .page .annotTextContent > h1 {
-  font-size: 1em;
-  border-bottom: 1px solid #000000;
-  padding-bottom: 0.2em;
-}
-
-.pdfViewer .page .annotTextContent > p {
-  padding-top: 0.2em;
-}
-
-.pdfViewer .page .annotLink > a {
-  position: absolute;
-  font-size: 1em;
-  top: 0;
-  left: 0;
-  width: 100%;
-  height: 100%;
-}
-
-.pdfViewer .page .annotLink > a /* -ms-a */  {
-  background: url("data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAA\
-                   LAAAAAABAAEAAAIBRAA7") 0 0 repeat;
-}