diff --git a/app/dune b/app/dune
index 2fe3b23..1a70a81 100644
--- a/app/dune
+++ b/app/dune
@@ -1,4 +1,4 @@
 (executable
  (name main)
- (public_name opam_graph)
+ (public_name opam-graph)
  (libraries cmdliner logs logs.fmt fmt.cli fmt.tty logs.cli opam-graph))
diff --git a/app/main.ml b/app/main.ml
index d51fb19..efa567c 100644
--- a/app/main.ml
+++ b/app/main.ml
@@ -12,24 +12,39 @@ let read_file file =
   with _ -> invalid_arg ("Error opening file " ^ file)
 
 let jump () transitive file output_format =
+  let module G = Opam_graph in
   let switch = read_file file in
   let data = OpamFile.SwitchExport.read_from_string switch in
   match output_format with
   | `Text ->
-    let graph = Opam_graph.dependencies ~transitive data in
-    Format.printf "%a" Opam_graph.pp_graph graph
+    let graph = G.dependencies ~transitive data in
+    Format.printf "%a" G.pp_graph graph
   | `Dot ->
-    let graph = Opam_graph.dependencies ~transitive data in
-    let dot = Opam_graph.Render.Dot.of_graph graph in
-    Format.printf "%a" Opam_graph.Render.Dot.pp dot
+    let graph = G.dependencies ~transitive data in
+    let dot = G.Render.Dot.of_graph graph in
+    Format.printf "%a" G.Render.Dot.pp dot
   | `Dot_ui ->
-    let graph = Opam_graph.Ui.dependencies ~transitive data in
-    let dot = Opam_graph.Render.Dot.of_assoc graph in
-    Format.printf "%a" Opam_graph.Render.Dot.pp dot
+    let graph = G.Ui.dependencies ~transitive data in
+    let dot = G.Render.Dot.of_assoc graph in
+    Format.printf "%a" G.Render.Dot.pp dot
   | `Html ->
-    let graph = Opam_graph.Ui.dependencies ~transitive data in
-    let html = Opam_graph.Render.Html.of_assoc graph in
-    Format.printf "%a" Opam_graph.Render.Html.pp html
+    let graph = G.Ui.dependencies ~transitive data in
+    let sharing_stats =
+      data
+      |> G.dependencies ~transitive:false
+      |> G.calc_sharing_stats in
+    let override_css = "\
+      .deps-svg-wrap {\
+        background: rgb(60, 60, 87); \
+      }\
+    "
+    in
+    let html =
+      G.Render.Html.of_assoc
+        ~override_css
+        ~sharing_stats graph
+    in
+    Format.printf "%a" G.Render.Html.pp html
 
 let setup_log style_renderer level =
   Fmt_tty.setup_std_outputs ?style_renderer ();
@@ -62,8 +77,15 @@ let file =
   Arg.(required & pos 0 (some file) None & info [ ] ~doc ~docv:"FILE")
 
 let cmd =
-  let term = Term.(const jump $ setup_log $ transitive $ file $ output_format) in
-  let info = Cmd.info "opam_graph" ~version:"%%VERSION%%" in
+  let term = Term.(
+    const jump
+    $ setup_log
+    $ transitive
+    $ file
+    $ output_format
+  ) in
+  let version = Fmt.str "%d" Opam_graph.visualization_version in
+  let info = Cmd.info "opam-graph" ~version in
   Cmd.v info term
 
 let () = Cmd.eval cmd |> exit
diff --git a/src/opam_graph.ml b/src/opam_graph.ml
index b9b5f9d..40942bc 100644
--- a/src/opam_graph.ml
+++ b/src/opam_graph.ml
@@ -1,4 +1,12 @@
 
+let visualization_version = 1
+(** Remember to increment this when anything changes that can affect the 
+    visualization, e.g.:
+      * algorithm change
+      * UI change
+      * certain library-dependency changes 
+*)
+
 let sprintf = Printf.sprintf
 
 module OSet = OpamPackage.Set