diff --git a/css/viewer.css b/css/viewer.css
index 0c229de2..c22a2b43 100644
--- a/css/viewer.css
+++ b/css/viewer.css
@@ -1,20 +1,3 @@
-.toolbarButton#secondaryToolbarClose::before {
-	display: block;
-	content: ' ';
-	background-image: url(../img/toolbarButton-secondaryToolbarClose.svg);
-	background-size: 16px 16px;
-	height: 16px;
-	width: 16px;
-}
-
-@media screen and (min-resolution: 2dppx) {
-	#secondaryToolbarClose::before {
-		background-size: 32px 32px !important;
-		height: 32px !important;
-		width: 32px !important;
-	}
-}
-
 /* Prevent printing from the browser when the download of a share is hidden. */
 @media print {
 	.pdfViewer.disabledTextSelection {
diff --git a/templates/viewer.php b/templates/viewer.php
index 680ddd3e..83cdc416 100644
--- a/templates/viewer.php
+++ b/templates/viewer.php
@@ -236,10 +236,6 @@
 
                 <div class="verticalToolbarSeparator hiddenSmallView"></div>
 
-                <button id="secondaryToolbarClose" class="toolbarButton" title="Close" tabindex="37" data-l10n-id="Close">
-                  <span data-l10n-id="close_label">Close</span>
-                </button>
-
                 <button id="secondaryToolbarToggle" class="toolbarButton" title="Tools" tabindex="36" data-l10n-id="tools">
                   <span data-l10n-id="tools_label">Tools</span>
                 </button>