preparation for slot dimediff reason

src/main/resources/static/css/style.css

@@ -449,6 +449,14 @@ body {
 	color: white;
 }
 
+.slot_reason {
+	color: #26a269;
+}
+
+[data-bs-theme=dark] .slot_reason {
+	color: lime;
+}
+
 .flex-row-weekday {
 	display: flex;
 	flex-flow: row wrap;