dark background for answers && no background for highlight

searx/static/themes/oscar/less/logicodev-dark/oscar.less

@@ -234,3 +234,12 @@ p.btn.btn-default{
   background: #d9534f;
 
 }
+
+.well {
+  background: #444;
+  border-color: #282a2e;
+}
+
+.highlight {
+  background-color: transparent !important;
+}