diff --git a/data/theme/gtk-styles.css b/data/theme/gtk-styles.css
index 6f1ce564..89d8e9e3 100644
--- a/data/theme/gtk-styles.css
+++ b/data/theme/gtk-styles.css
@@ -315,6 +315,16 @@ datechooser .weekday:backdrop {
 }
 
 /* days */
+datechooser day {
+  transition-property: background-color;
+  transition-duration: 200ms;
+}
+
+datechooser day label {
+  transition-property: color;
+  transition-duration: 200ms;
+}
+
 datechooser day {
   min-height: 32px;
   min-width: 32px;