diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..9b9682b
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,44 @@
+name: Install, test and format
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+    branches:
+      - "main"
+
+permissions: read-all
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-latest
+          - ubuntu-latest
+        ocaml-compiler:
+          - "5.1"
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set-up OCaml version:${{ matrix.ocaml-compiler }} in os:${{ matrix.os }}
+        uses: ocaml/setup-ocaml@v2
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
+
+      - name: Install Dependencies
+        run: |
+          opam install --deps-only -t -y .
+          opam install ocamlformat.0.26.1
+
+      - name: Test
+        run: opam exec -- dune runtest
+
+      - name: Format
+        run: opam exec -- dune build @fmt
diff --git a/.github/workflows/ocaml-ci-setup.yml b/.github/workflows/ocaml-ci-setup.yml
new file mode 100644
index 0000000..95966f4
--- /dev/null
+++ b/.github/workflows/ocaml-ci-setup.yml
@@ -0,0 +1,50 @@
+name: CI Run test
+
+on:
+  push:
+    branches:
+      - 'main'
+  pull_request:
+    branches:
+      - 'main'
+
+jobs:
+# See: https://github.com/ocaml/setup-ocaml
+  setup-ocaml:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Setup OCaml environment
+        run: setup-ocaml
+          
+  install-dependencies:
+    runs-on: ubuntu-latest
+    needs: setup-ocaml
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Install project dependencies
+        run: opam install --deps-only -t -y 
+
+  run-tests:
+    runs-on: ubuntu-latest
+    needs: install-dependencies
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Run tests
+        run: dune runtest
+
+  check-formatting:
+  runs-on: ubuntu-latest
+  needs: install-dependencies
+  steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Check formatting
+      env:
+        OCAMLFORMAT: "0.26.1"
+      run: dune build @fmt
+    
+
diff --git a/lib/interactive_viewer.ml b/lib/interactive_viewer.ml
index 1c58750..b33f1e2 100644
--- a/lib/interactive_viewer.ml
+++ b/lib/interactive_viewer.ml
@@ -110,12 +110,19 @@ let view (patches : Patch.t list) =
     | None -> failwith "zipper_of_list: empty list"
   in
   let curr_scroll_state = Lwd.var W.default_scroll_state in
+  let curr_scroll_state_1 = Lwd.var W.default_scroll_state in
   let change_scroll_state _action state =
-    let off_screen = state.W.position > state.W.bound in
-    if off_screen then
+    let y_off_screen = state.W.position > state.W.bound in
+    if y_off_screen then
       Lwd.set curr_scroll_state { state with position = state.W.bound }
     else Lwd.set curr_scroll_state state
   in
+  let change_scroll_state_1 _action state =
+    let x_off_screen = state.W.position > state.W.bound in
+    if x_off_screen then
+      Lwd.set curr_scroll_state_1 { state with position = state.W.bound }
+    else Lwd.set curr_scroll_state_1 state
+  in
   W.vbox
     [
       operation_info z_patches;
@@ -125,6 +132,10 @@ let view (patches : Patch.t list) =
         ~state:(Lwd.get curr_scroll_state)
         ~change:change_scroll_state
       @@ current_hunks z_patches;
+      W.hscroll_area
+        ~state:(Lwd.get curr_scroll_state_1)
+        ~change:change_scroll_state_1
+      @@ current_hunks z_patches;
       Lwd.pure
       @@ Ui.keyboard_area
            (function
diff --git a/vendor/lwd/lib/nottui/nottui_widgets.ml b/vendor/lwd/lib/nottui/nottui_widgets.ml
index c67e9c1..ad29c07 100644
--- a/vendor/lwd/lib/nottui/nottui_widgets.ml
+++ b/vendor/lwd/lib/nottui/nottui_widgets.ml
@@ -141,6 +141,16 @@ let menu_overlay wm g ?(dx=0) ?(dy=0) body around =
 
 let scroll_step = 1
 
+(* type scroll_state = {
+  y_position: int;
+  x_position: int;
+  y_bound : int;
+  x_bound : int;
+  y_visible : int;
+  x_visible : int;
+  y_total : int;
+  x_total : int;
+} *)
 type scroll_state = {
   position: int;
   bound : int;
@@ -148,50 +158,100 @@ type scroll_state = {
   total : int;
 }
 
-let default_scroll_state = { position = 0; bound = 0; visible = 0; total = 0 }
+
+(* let default_scroll_state = { y_position = 0; y_bound = 0; y_visible = 0; y_total = 0; x_position = 0; x_bound = 0; x_visible = 0; x_total = 0; } *)
+let default_scroll_state = { position = 0; bound = 0; visible = 0; total = 0; }
 
 let vscroll_area ~state ~change t =
-  let visible = ref (-1) in
-  let total = ref (-1) in
-  let scroll state delta =
-    let position = state.position + delta in
-    let position = clampi position ~min:0 ~max:state.bound in
-    if position <> state.position then
-      change `Action {state with position};
-    `Handled
+  let y_visible = ref (-1) in
+  let y_total = ref (-1) in
+  let scroll state delta del =
+      let y_position = state.position + delta in
+      let position = clampi y_position ~min:0 ~max:state.bound in
+      if position <> state.position then 
+        change `Action {state with position};
+      `Handled
   in
   let focus_handler state = function
-    (*| `Arrow `Left , _ -> scroll (-scroll_step) 0*)
-    (*| `Arrow `Right, _ -> scroll (+scroll_step) 0*)
-    | `Arrow `Up   , [] -> scroll state (-scroll_step)
-    | `Arrow `Down , [] -> scroll state (+scroll_step)
-    | `Page `Up, [] -> scroll state ((-scroll_step) * 8)
-    | `Page `Down, [] -> scroll state ((+scroll_step) * 8)
+    | `Arrow `Left , [] -> scroll state (0) (-scroll_step) 
+    | `Arrow `Right, [] -> scroll state (0) (+scroll_step) 
+    | `Arrow `Up   , [] -> scroll state (-scroll_step) (0)
+    | `Arrow `Down , [] -> scroll state (+scroll_step) (0)
+    | `Page `Up, [] -> scroll state ((-scroll_step) * 8) (0)
+    | `Page `Down, [] -> scroll state ((+scroll_step) * 8) (0)
     | _ -> `Unhandled
   in
   let scroll_handler state ~x:_ ~y:_ = function
-    | `Scroll `Up   -> scroll state (-scroll_step)
-    | `Scroll `Down -> scroll state (+scroll_step)
+    | `Scroll `Up   -> scroll state (-scroll_step) (0) 
+    | `Scroll `Down -> scroll state (+scroll_step) (0)
+
     | _ -> `Unhandled
   in
   Lwd.map2 t state ~f:begin fun t state ->
     t
     |> Ui.shift_area 0 state.position
     |> Ui.resize ~h:0 ~sh:1
-    |> Ui.size_sensor (fun ~w:_ ~h ->
-        let tchange =
-          if !total <> (Ui.layout_spec t).Ui.h
-          then (total := (Ui.layout_spec t).Ui.h; true)
+    |> Ui.size_sensor (fun ~w ~h ->
+        let tychange =
+          if !y_total <> (Ui.layout_spec t).Ui.h
+          then (y_total := (Ui.layout_spec t).Ui.h; true)
+          else false
+        in
+        let vychange =
+          if !y_visible <> h
+          then (y_visible := h; true)
+          else false
+        in
+        if tychange || vychange then
+          change `Content {state with visible = !y_visible; total = !y_total;
+                                      bound = maxi 0 (!y_total - !y_visible);}
+      )
+    |> Ui.mouse_area (scroll_handler state)
+    |> Ui.keyboard_area (focus_handler state)
+  end
+let hscroll_area ~state ~change t =
+  let x_visible = ref (-1) in
+  let x_total = ref (-1) in
+  let scroll state delta del =
+      let x_position = state.position + del in
+      let position = clampi x_position ~min:0 ~max:state.bound in
+      if x_position <> state.position then 
+        change `Action {state with position};
+      `Handled
+  in
+  let focus_handler state = function
+    | `Arrow `Left , [] -> scroll state (0) (-scroll_step) 
+    | `Arrow `Right, [] -> scroll state (0) (+scroll_step) 
+    | `Arrow `Up   , [] -> scroll state (-scroll_step) (0)
+    | `Arrow `Down , [] -> scroll state (+scroll_step) (0)
+    | `Page `Up, [] -> scroll state ((-scroll_step) * 8) (0)
+    | `Page `Down, [] -> scroll state ((+scroll_step) * 8) (0)
+    | _ -> `Unhandled
+  in
+  let scroll_handler state ~x:_ ~y:_ = function
+    | `Scroll `Up   -> scroll state (-scroll_step) (0) 
+    | `Scroll `Down -> scroll state (+scroll_step) (0)
+
+    | _ -> `Unhandled
+  in
+  Lwd.map2 t state ~f:begin fun t state ->
+    t
+    |> Ui.shift_area state.position 0
+    |> Ui.resize ~w:0 ~sw:1
+    |> Ui.size_sensor (fun ~w ~h ->
+        let txchange =
+          if !x_total <> (Ui.layout_spec t).Ui.w
+          then (x_total := (Ui.layout_spec t).Ui.w; true)
           else false
         in
-        let vchange =
-          if !visible <> h
-          then (visible := h; true)
+        let vxchange =
+          if !x_visible <> w
+          then (x_visible := w; true)
           else false
         in
-        if tchange || vchange then
-          change `Content {state with visible = !visible; total = !total;
-                                      bound = maxi 0 (!total - !visible); }
+        if txchange || vxchange  then
+          change `Content {state with visible = !x_visible; total = !x_total;
+                                      bound = maxi 0 (!x_total - !x_visible);  }
       )
     |> Ui.mouse_area (scroll_handler state)
     |> Ui.keyboard_area (focus_handler state)
diff --git a/vendor/lwd/lib/nottui/nottui_widgets.mli b/vendor/lwd/lib/nottui/nottui_widgets.mli
index 071a764..8165a89 100644
--- a/vendor/lwd/lib/nottui/nottui_widgets.mli
+++ b/vendor/lwd/lib/nottui/nottui_widgets.mli
@@ -31,14 +31,19 @@ val sub_entry : string -> (unit -> unit) -> ui
 
 (* FIXME Explain how scrolling works *)
 val scroll_step : int
-type scroll_state = { position : int; bound : int; visible : int; total : int }
+type scroll_state = { position : int; bound : int; visible : int; total : int; }
 val default_scroll_state : scroll_state
 val vscroll_area :
   state:scroll_state Lwd.t ->
   change:([> `Action | `Content ] -> scroll_state -> unit) ->
   ui Lwd.t -> ui Lwd.t
 
-val scroll_area :
+val hscroll_area :
+  state:scroll_state Lwd.t ->
+  change:([> `Action | `Content ] -> scroll_state -> unit) ->
+  ui Lwd.t -> ui Lwd.t 
+
+ val scroll_area :
   ?offset:int * int -> ui Lwd.t -> ui Lwd.t
 
 val scrollbox: ui Lwd.t -> ui Lwd.t