diff --git a/chrome/content/zotero-platform/mac/overlay.css b/chrome/content/zotero-platform/mac/overlay.css
index fc2911e58..0d3ef0981 100644
--- a/chrome/content/zotero-platform/mac/overlay.css
+++ b/chrome/content/zotero-platform/mac/overlay.css
@@ -108,9 +108,13 @@
 }
 
 @media (min-resolution: 1.5dppx) {
-	.zotero-tb-button > .toolbarbutton-icon {
+	#zotero-pane .toolbarbutton-icon {
 		max-width: 28px;
 	}
+	
+	#zotero-tb-sync-error .toolbarbutton-icon {
+		width: 16px;
+	}
 }
 
 .zotero-tb-button, .zotero-tb-button:first-child, .zotero-tb-button:last-child {
diff --git a/chrome/content/zotero-platform/unix/overlay.css b/chrome/content/zotero-platform/unix/overlay.css
index 25561b683..5dad77db1 100644
--- a/chrome/content/zotero-platform/unix/overlay.css
+++ b/chrome/content/zotero-platform/unix/overlay.css
@@ -93,7 +93,7 @@
 /* End toolbar buttons */
 
 
-@media (min-resolution: 1dppx) {
+@media (min-resolution: 1.5dppx) {
 	#zotero-toolbar .toolbarbutton-icon {
 		width: 16px;
 	}
diff --git a/chrome/content/zotero-platform/win/overlay.css b/chrome/content/zotero-platform/win/overlay.css
index ea5c06a21..19fa5e9e9 100644
--- a/chrome/content/zotero-platform/win/overlay.css
+++ b/chrome/content/zotero-platform/win/overlay.css
@@ -100,7 +100,7 @@
 }
 /* End toolbar buttons */
 
-@media (min-resolution: 1dppx) {
+@media (min-resolution: 1.5dppx) {
 	#zotero-toolbar .toolbarbutton-icon {
 		width: 16px;
 	}