no need for attribute selctors

CSS/themes/duplicacy/duplicacy-base.css

@@ -142,27 +142,27 @@ body,
     background: rgb(255 255 255 / 8%) !important;
 }
 
-div[id='schedule-0'],
-div[id='schedule-1'],
-div[id='schedule-2'],
-div[id='schedule-3'],
-div[id='schedule-4'],
-div[id='schedule-5'],
-div[id='schedule-6'],
-div[id='schedule-7'],
-div[id='schedule-8'],
-div[id='schedule-9'],
-div[id='schedule-10'],
-div[id='schedule-11'],
-div[id='schedule-12'],
-div[id='schedule-13'],
-div[id='schedule-14'],
-div[id='schedule-15'],
-div[id='schedule-16'],
-div[id='schedule-17'],
-div[id='schedule-18'],
-div[id='schedule-19'],
-div[id='schedule-20'] {
+#schedule-0,
+#schedule-1,
+#schedule-2,
+#schedule-3,
+#schedule-4,
+#schedule-5,
+#schedule-6,
+#schedule-7,
+#schedule-8,
+#schedule-9,
+#schedule-10,
+#schedule-11,
+#schedule-12,
+#schedule-13,
+#schedule-14,
+#schedule-15,
+#schedule-16,
+#schedule-17,
+#schedule-18,
+#schedule-19,
+#schedule-20 {
     background-color: rgb(255 255 255 / 8%);
 }