add tmux plugin: prefix_highlight

.tmux.conf

@@ -33,7 +33,6 @@ set -g mouse-select-pane on
 set -g mouse-resize-pane
 set -g mouse-select-window on
 
-
 ##########################################
 ### Styling
 ##########################################
@@ -54,7 +53,7 @@ set -g status-fg colour137
 set -g status-attr dim
 set -g status-left ''
 set -g status-left-length 20
-set -g status-right "#[fg=colour233,bg=colour245,bold] #(tmux-mem-cpu-load -g 5 --interval 1) %H:%M:%S "
+set -g status-right "#{prefix_highlight} #[fg=colour233,bg=colour245,bold] #(tmux-mem-cpu-load -g 5 --interval 1) %H:%M:%S "
 set -g status-right-length 60
 
 # messaging
@@ -138,3 +137,14 @@ bind-key C-b last-window
 
 # special settings for MacOS
 if-shell 'test "$(uname)" = "Darwin"' 'source ~/.tmux-osx.conf'
+
+##########################################
+### Plugins
+##########################################
+
+# prefix_highlight (https://github.com/tmux-plugins/tmux-prefix-highlight)
+run-shell ~/.tmux/prefix_highlight.tmux
+set -g @prefix_highlight_fg 'white' # default is 'colour231'
+set -g @prefix_highlight_bg 'blue'  # default is 'colour04'
+set -g @prefix_highlight_show_copy_mode 'on'
+set -g @prefix_highlight_copy_mode_attr 'fg=black,bg=yellow,bold' # default is 'fg=default,bg=yellow'