diff --git a/res/css/structures/_ViewSource.scss b/res/css/structures/_ViewSource.scss
index f1ada65786..3dc3e21489 100644
--- a/res/css/structures/_ViewSource.scss
+++ b/res/css/structures/_ViewSource.scss
@@ -44,3 +44,7 @@ limitations under the License.
 .mx_ViewSource_container {
     max-width: calc(100% - 24px);
 }
+
+.mx_ViewSource_container .mx_CopyableText_border {
+    width: 100%;
+}