diff --git a/static/styles/zulip.css b/static/styles/zulip.css
index dabd1b2e6c..0f804ebc75 100644
--- a/static/styles/zulip.css
+++ b/static/styles/zulip.css
@@ -1015,25 +1015,6 @@ just a temporary hack.
     opacity: 1;
 }
 
-/* Selected messages use an inset box shadow to highlight, with
-   different highlight colors for selected messages, selected mentions,
-   and selected private messages */
-
-.selected_message + .message_row .messagebox {
-    box-shadow: inset 0px 4px 5px -4px #3093c3, inset -2px 0px 1px -2px #333;
-}
-
-.selected_message + .message_row .messagebox_colorblock {
-    box-shadow: inset 0px 4px 5px -4px #3093c3, inset 2px 0px 1px -2px #333;
-}
-
-.selected_message + .message_row.last_message .messagebox {
-    box-shadow: inset 0px 4px 5px -4px #3093c3, inset -2px 0px 1px -2px #333, inset 0px -2px 1px -2px #333;
-}
-
-.selected_message + .message_row.last_message .messagebox_colorblock {
-    box-shadow: inset 0px 4px 5px -4px #3093c3, inset 2px 0px 1px -2px #333, inset 0px -2px 1px -2px #333;
-}
 
 .selected_message .messagebox_colorblock, .selected_message .summary_colorblock {
     box-shadow: 0px 0px 5px 0px #3093c3, inset 3px 0px 1px -2px #39afe8, inset 0px -3px 1px -2px #39afe8, inset 0px 3px 1px -2px #39afe8, inset -12px 0px 0px -1px rgba(240,240,240,0.6);