Improve relation tree visualizations

Change-Id: I99c414a61f48ad237746f54885ca7ef6afadb6dd
diff --git a/dev/scss/main/main.scss b/dev/scss/main/main.scss
index e73bce3..f6d1b7a 100644
--- a/dev/scss/main/main.scss
+++ b/dev/scss/main/main.scss
@@ -1,7 +1,8 @@
 @import "highlight";  // JSON highlighting
 @import "kwic";       // Kwic view information
 @import "logos";      // Logo images
-@import "matchinfo";  // Match table and tree
+@import "matchinfo";  // Match table
+@import "tree";       // Tree view
 @import "pagination"; // Pagination
 @import "query";      // View query
 @import "resultinfo"; // Information on results