diff --git a/src/css/app.scss b/src/css/app.scss
index 26a8fce1..d787f14f 100644
--- a/src/css/app.scss
+++ b/src/css/app.scss
@@ -56,6 +56,12 @@ html {
   border-radius: 0.5rem;
 }
 
+*,
+::before,
+::after {
+  transition: 100ms background ease-in-out;
+}
+
 .bordered {
   border: 1px solid var(--border-color);
 }