Increase specificity of CSS rule instead of using !important to shield

zone labels from LMS rules for <p> elements.

drag_and_drop_v2/public/css/drag_and_drop.css

@@ -242,16 +242,15 @@
     border: 2px solid #a5a5a5;
 }
 
-.xblock--drag-and-drop .zone p {
+.xblock--drag-and-drop .drag-container .target .zone p {
     width: 100%;
     font-family: Arial;
     font-size: 16px;
     font-weight: bold;
     text-align: center;
     text-transform: uppercase;
-    margin-top: auto;  /* Shield zone labels from LMS rules that change margin-bottom for <p> elements */
-                       /* to make sure they are centered vertically */
-    margin-bottom: auto !important;
+    margin-top: auto;
+    margin-bottom: auto;
 }
 
 /*** FEEDBACK ***/