_sass: Darken colors for sufficient schedule-event contrast

Author: kevinlin1

_sass/custom/schedule.scss

@@ -72,7 +72,7 @@
   }
 
   .schedule-event {
-    background-color: $grey-dk-000;
+    background-color: $grey-dk-100;
     border-radius: $border-radius;
     box-shadow: 0 10px 20px rgba(0, 0, 0, .1), inset 0 -3px 0 rgba(0, 0, 0, .2);
     color: $white;
@@ -93,15 +93,15 @@
     }
 
     &.lecture {
-      background-color: $grey-dk-000;
+      background-color: $grey-dk-100;
     }
 
     &.section {
-      background-color: $purple-000;
+      background-color: $purple-100;
     }
 
     &.office-hours {
-      background-color: $blue-000;
+      background-color: $blue-100;
     }
   }
 }