studio - styled first children in an overview's subsection list for drag and drop work

cms/static/sass/_courseware.scss

@@ -645,10 +645,19 @@ input.courseware-unit-search-input {
 	color: $darkGrey;
 }
 
+// sort/drag and drop
 .ui-droppable {
-    min-height: 22px;
+  min-height: 20px;
+
   &.dropover {
-        padding-top: 11px;
-        padding-bottom: 11px;
+    padding-top: 10px;
+    padding-bottom: 10px;
   }
 }
+
+ol.ui-droppable .branch:first-child .section-item {
+	border-top: none;
+}
+
+
+