diff --git a/res/css/views/elements/_ImageView.scss b/res/css/views/elements/_ImageView.scss
index 2672eef849..93ebcc2d56 100644
--- a/res/css/views/elements/_ImageView.scss
+++ b/res/css/views/elements/_ImageView.scss
@@ -111,7 +111,7 @@ limitations under the License.
 
 .mx_ImageView_button_close {
     border-radius: 100%;
-    background: #21262c;
+    background: #21262c; // same on all themes
     &::before {
         width: 32px;
         height: 32px;