Use matching colours for labels

Author: Sean Prashad

web/src/components/Table/styles.scss

@@ -12,14 +12,14 @@
   }
 
   .easy {
-    background-color: green;
+    background-color: #5cb85c;
   }
 
   .medium {
-    background-color: orange;
+    background-color: #f0ad4e;
   }
 
   .hard {
-    background-color: red;
+    background-color: #d9534f;
   }
 }