diff --git a/assets/css/src/variables.css b/assets/css/src/variables.css
index c73b828..1dce9b2 100644
--- a/assets/css/src/variables.css
+++ b/assets/css/src/variables.css
@@ -38,6 +38,8 @@
   --color-mint: #45e6ba;
   --color-brown: #a59478;
   --color-brown-light: #d6cfbe;
+
+  --transition-image-opacity: opacity 0.3s ease-in-out;
 }
 
 @media screen and (max-width: 800px) {