diff --git a/openslides/mediafiles/static/js/mediafiles/site.js b/openslides/mediafiles/static/js/mediafiles/site.js
index bbba1cd8b..7e3578b86 100644
--- a/openslides/mediafiles/static/js/mediafiles/site.js
+++ b/openslides/mediafiles/static/js/mediafiles/site.js
@@ -141,7 +141,7 @@ angular.module('OpenSlidesApp.mediafiles.site', ['ngFileUpload', 'OpenSlidesApp.
                     id: mediafile.id,
                     numPages: mediafile.mediafile.pages,
                     page: 1,
-                    scale: 1,
+                    scale: 'page-fit',
                     rotate: 0,
                     visible: true
             }];
diff --git a/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html b/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html
index d50c3289a..ccadb99dc 100644
--- a/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html
+++ b/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html
@@ -29,10 +29,12 @@
           <nav ng-class="getNavStyle(scroll)" class="form-inline">
             <div class="btn-group">
               <button class="btn btn-default" ng-click="mediafileGoToPage(presentedMediafile.page - 1)"
+                  ng-class="{ 'disabled': (presentedMediafile.page - 1) < 1 }"
                   title="{{ 'Previous page' | translate }}">
                 <i class="fa fa-backward"></i>
               </button>
               <button class="btn btn-default" ng-click="mediafileGoToPage(presentedMediafile.page + 1)"
+                  ng-class="{ 'disabled': (presentedMediafile.page + 1) > presentedMediafile.numPages }"
                   title="{{ 'Next page' | translate }}">
                 <i class="fa fa-forward"></i>
               </button>
@@ -52,8 +54,9 @@
               <button class="btn btn-default" ng-click="mediafileZoomOut()" title="{{ 'Zoom out' | translate }}">
                 <i class="fa fa-search-minus"></i>
               </button>
-              <button class="btn btn-default" ng-click="mediafileFit()" title="{{ 'Reset zoom' | translate }}">
-                  100%
+              <button class="btn" ng-click="mediafileFit()" title="{{ 'Reset zoom' | translate }}"
+                  ng-class="presentedMediafile.scale=='page-fit' ? 'btn-primary' : 'btn-default'">
+                100%
               </button>
               <button class="btn btn-default" ng-click="mediafileZoomIn()" title="{{ 'Zoom in' | translate }}">
                 <i class="fa fa-search-plus"></i>