Make my dropdown menu black like my navbar

I like the black-on-white asthetic, so let's make the dropdown menu do
that. I pulled this code from
https://github.com/twbs/bootstrap/issues/9588

It works great now that I'm processing my sass

styles/vanth.scss

@@ -7,3 +7,18 @@
   position: relative;
   left: 20px;
 }
+
+.inverse-dropdown{
+  background-color: #222;
+  border-color: #080808;
+  &>li>a {
+    color: #999;
+    &:hover {
+      color: #fff;
+      background-color: #000;
+    }
+  }
+  &>.divider {
+    background-color: #000;
+  }
+}