wires this code to the PROPER prefs

code/modules/client/preferences.dm

@@ -51,7 +51,6 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 	var/ooccolor = "#c43b23"
 	var/aooccolor = "#ce254f"
 	var/enable_tips = TRUE
-	var/itemoutline_pref = TRUE
 	var/tip_delay = 500 //tip delay in milliseconds
 
 	//Antag preferences
@@ -62,7 +61,7 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 
 	var/UI_style = null
 	var/outline_enabled = TRUE
-	var/outline_color = COLOR_BLUE_GRAY
+	var/outline_color = COLOR_THEME_MIDNIGHT
 	var/buttons_locked = FALSE
 	var/hotkeys = FALSE
 
@@ -786,7 +785,7 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 			dat += "<h2>General Settings</h2>"
 			dat += "<b>UI Style:</b> <a href='?_src_=prefs;task=input;preference=ui'>[UI_style]</a><br>"
 			dat += "<b>Outline:</b> <a href='?_src_=prefs;preference=outline_enabled'>[outline_enabled ? "Enabled" : "Disabled"]</a><br>"
-			dat += "<b>Outline Color:</b> <span style='border:1px solid #161616; background-color: [outline_color];'>&nbsp;&nbsp;&nbsp;</span> <a href='?_src_=prefs;preference=outline_color'>Change</a><BR>"
+			dat += "<b>Outline Color:</b> [outline_color ? "<span style='border:1px solid #161616; background-color: [outline_color];'>" : "Theme-based (null)"]&nbsp;&nbsp;&nbsp;</span> <a href='?_src_=prefs;preference=outline_color'>Change</a><BR>"
 			dat += "<b>tgui Monitors:</b> <a href='?_src_=prefs;preference=tgui_lock'>[(tgui_lock) ? "Primary" : "All"]</a><br>"
 			dat += "<b>tgui Style:</b> <a href='?_src_=prefs;preference=tgui_fancy'>[(tgui_fancy) ? "Fancy" : "No Frills"]</a><br>"
 			dat += "<b>Show Runechat Chat Bubbles:</b> <a href='?_src_=prefs;preference=chat_on_map'>[chat_on_map ? "Enabled" : "Disabled"]</a><br>"
@@ -2740,8 +2739,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 					outline_enabled = !outline_enabled
 				if("outline_color")
 					var/pickedOutlineColor = input(user, "Choose your outline color.", "General Preference", outline_color) as color|null
-					if(pickedOutlineColor)
-						outline_color = pickedOutlineColor
+					if(pickedOutlineColor != pickedOutlineColor)
+						outline_color = pickedOutlineColor // nullable
 				if("tgui_lock")
 					tgui_lock = !tgui_lock
 				if("winflash")

code/modules/client/preferences_savefile.dm

@@ -47,7 +47,7 @@ SAVEFILE UPDATING/VERSIONING - 'Simplified', or rather, more coder-friendly ~Car
 		addtimer(CALLBACK(src, .proc/force_reset_keybindings), 30)	//No mob available when this is run, timer allows user choice.
 	if(current_version < 30)
 		outline_enabled = TRUE
-		outline_color = COLOR_BLUE_GRAY
+		outline_color = COLOR_THEME_MIDNIGHT
 
 /datum/preferences/proc/update_character(current_version, savefile/S)
 	if(current_version < 19)
@@ -416,7 +416,6 @@ SAVEFILE UPDATING/VERSIONING - 'Simplified', or rather, more coder-friendly ~Car
 	S["hud_toggle_color"]	>> hud_toggle_color
 	S["menuoptions"]		>> menuoptions
 	S["enable_tips"]		>> enable_tips
-	S["itemoutline_pref"]		>> itemoutline_pref
 	S["tip_delay"]			>> tip_delay
 	S["pda_style"]			>> pda_style
 	S["pda_color"]			>> pda_color
@@ -592,7 +591,6 @@ SAVEFILE UPDATING/VERSIONING - 'Simplified', or rather, more coder-friendly ~Car
 	WRITE_FILE(S["hud_toggle_color"], hud_toggle_color)
 	WRITE_FILE(S["menuoptions"], menuoptions)
 	WRITE_FILE(S["enable_tips"], enable_tips)
-	WRITE_FILE(S["itemoutline_pref"], itemoutline_pref)
 	WRITE_FILE(S["tip_delay"], tip_delay)
 	WRITE_FILE(S["pda_style"], pda_style)
 	WRITE_FILE(S["pda_color"], pda_color)

code/modules/client/verbs/etips.dm

@@ -24,6 +24,6 @@
 	set desc = "Toggles hover-over item outline"
 	set category = "Preferences"
 
-	prefs.itemoutline_pref = !prefs.itemoutline_pref
+	prefs.outline_enabled = !prefs.outline_enabled
 	prefs.save_preferences()
 	to_chat(usr, "<span class='danger'>Item outline [prefs.itemoutline_pref ? "en" : "dis"]abled.</span>")