diff --git a/src/app/annotationViewer/_annotation_viewer.scss b/src/app/annotationViewer/_annotation_viewer.scss
index 68bef606..c7787f9d 100644
--- a/src/app/annotationViewer/_annotation_viewer.scss
+++ b/src/app/annotationViewer/_annotation_viewer.scss
@@ -82,6 +82,7 @@ baw-annotation-viewer {
         */
       height: 256px;
       border: 1px solid $spectrogramBorder;
+      border-width: 1px 0px 1px 0px;
 
     }