diff --git a/public/css/inventory.styl b/public/css/inventory.styl
index 468a9d15db..08cceeab57 100644
--- a/public/css/inventory.styl
+++ b/public/css/inventory.styl
@@ -111,6 +111,10 @@ menu.pets .customize-menu
     .PixelPaw
       margin-top: 36px // align paw with pets, at the bottom of the button
 
+// styles for pets that have been fed until they evolve into a mount
+.pet-evolved
+    opacity: 0.1
+
 .selectableInventory
   background-color: lightgreen !important
   border-radius: 50%
diff --git a/views/options/inventory/stable.jade b/views/options/inventory/stable.jade
index d228ece0f2..ee38d05564 100644
--- a/views/options/inventory/stable.jade
+++ b/views/options/inventory/stable.jade
@@ -58,9 +58,7 @@ script(type='text/ng-template', id='partials/options.inventory.pets.html')
                     .progress-bar.progress-bar-success(style="width:{{user.items.pets[pet]/.5}}%")
                 button(class="pet-button pet-not-owned", ng-if='!user.items.pets[pet]')
                   .PixelPaw
-                // How to apply this style in stylus files?
-                button(class="pet-button Pet-{{pet}}" ng-if='user.items.pets[pet]<0',style='opacity:0.1;filter:alpha(opacity=10)')
-                  //if this could be changed to the opacity talked about? can't figure it out
+                button(class="pet-evolved pet-button Pet-{{pet}}", ng-if='user.items.pets[pet]<0')
       .col-md-12
         h4=env.t('questPets')
         menu.pets(type='list')
@@ -72,7 +70,7 @@ script(type='text/ng-template', id='partials/options.inventory.pets.html')
                     .progress-bar.progress-bar-success(style="width:{{user.items.pets[pet]/.5}}%")
                 button(class="pet-button pet-not-owned", ng-if='!user.items.pets[pet]')
                   .PixelPaw
-                button(class="pet-button Pet-{{pet}}" ng-if='user.items.pets[pet]<0',style='opacity:0.1;filter:alpha(opacity=10)')
+                button(class="pet-evolved pet-button Pet-{{pet}}", ng-if='user.items.pets[pet]<0')
 
       .col-md-12
         h4=env.t('rarePets')