diff --git a/code/modules/client/preferences_savefile.dm b/code/modules/client/preferences_savefile.dm
index 06fceecce71..53c66f1f520 100644
--- a/code/modules/client/preferences_savefile.dm
+++ b/code/modules/client/preferences_savefile.dm
@@ -192,8 +192,7 @@ SAVEFILE UPDATING/VERSIONING - 'Simplified', or rather, more coder-friendly ~Car
 	//Sanitize
 	ooccolor		= sanitize_ooccolor(sanitize_hexcolor(ooccolor, 6, 1, initial(ooccolor)))
 	lastchangelog	= sanitize_text(lastchangelog, initial(lastchangelog))
-	UI_style		= sanitize_inlist(UI_style, list("Midnight", "Plasmafire", "Retro","Slimecore"
-	), initial(UI_style))
+	UI_style		= sanitize_inlist(UI_style, list("Midnight", "Plasmafire", "Retro", "Slimecore", "Operative"), initial(UI_style))
 	nanoui_fancy	= sanitize_integer(nanoui_fancy, 0, 1, initial(nanoui_fancy))
 	default_slot	= sanitize_integer(default_slot, 1, max_save_slots, initial(default_slot))
 	toggles			= sanitize_integer(toggles, 0, 65535, initial(toggles))
diff --git a/code/modules/tooltip/tooltip.dm b/code/modules/tooltip/tooltip.dm
index eb306655402..1ef38cf1383 100644
--- a/code/modules/tooltip/tooltip.dm
+++ b/code/modules/tooltip/tooltip.dm
@@ -96,7 +96,7 @@ Notes:
 
 
 //Open a tooltip for user, at a location based on params
-//Theme is a CSS class in tooltip.html, by default this wrapper chooses a CSS class based on the user's UI_style (Midnight, Plasmafire, Retro)
+//Theme is a CSS class in tooltip.html, by default this wrapper chooses a CSS class based on the user's UI_style (Midnight, Plasmafire, Retro, etc)
 //Includes sanity.checks
 /proc/openToolTip(mob/user = null, atom/movable/tip_src = null, params = null,title = "",content = "",theme = "")
 	if(istype(user))
diff --git a/code/modules/tooltip/tooltip.html b/code/modules/tooltip/tooltip.html
index 04a471d4559..782ef5be7a1 100644
--- a/code/modules/tooltip/tooltip.html
+++ b/code/modules/tooltip/tooltip.html
@@ -61,6 +61,12 @@
 
 		.retro .wrap {border-color: #005E00;}
 		.retro .content {color: #003366; border-color: #005E00; background-color: #00BD00;}
+
+		.slimecore .wrap {border-color: #2B2B33;}
+		.slimecore .content {color: #6EA161; border-color: #2B2B33; background-color: #354E35;}
+
+		.operative .wrap {border-color: #A10000;}
+		.operative .content {color: #0F0B0C ; border-color: #A10000; background-color: #382626;}
 		
 
 	</style>
diff --git a/icons/mob/screen_operative.dmi b/icons/mob/screen_operative.dmi
index b62ab3fb9ec..01c64e5a4fd 100644
Binary files a/icons/mob/screen_operative.dmi and b/icons/mob/screen_operative.dmi differ
diff --git a/icons/mob/screen_slimecore.dmi b/icons/mob/screen_slimecore.dmi
index 43c17abcd97..27c6602d6cd 100644
Binary files a/icons/mob/screen_slimecore.dmi and b/icons/mob/screen_slimecore.dmi differ