diff --git a/src/routes/index.lisp b/src/routes/index.lisp
index a6b2504..81b66fa 100644
--- a/src/routes/index.lisp
+++ b/src/routes/index.lisp
@@ -9,22 +9,57 @@
 
 ;;; View
 
+(pi:define-element counter (value)
+  (pi:h
+    (div :id "counter" :class "h-10 w-20 text-4xl badge badge-neutral"
+       value)))
+
 (pi:define-element page ()
   (pi:h
     (ui:layout
       (section :class "h-full flex justify-center items-center"
-        (h1 :class "text-4xl text-amber-500"
-          "Hello HTMX from Common Lisp!")))))
+        (div :class "flex flex-col items-center gap-4"
+          (counter :value *counter*)
+          (button
+            :hx-target "#counter"
+            :hx-post   "/counter/decrease"
+            :hx-swap   "outerHTML"
+            :class     "btn btn-neutral-content"
+            "Decrease -")
+          (button
+            :hx-target "#counter"
+            :hx-post   "/counter/increase"
+            :hx-swap   "outerHTML"
+            :class     "btn btn-neutral-content"
+            "Increase +"))))))
 
 ;;; Controller
 
+(defparameter *counter* 0)
+
 (defun index (params)
   (declare (ignore params))
   (jg:with-html-response
     (pi:element-string (page))))
 
+(defun increase (params)
+  (declare (ignore params))
+  (jg:with-html-response
+    (pi:element-string
+      (counter :value (incf *counter*)))))
+
+(defun decrease (params)
+  (declare (ignore params))
+  (jg:with-html-response
+    (pi:element-string
+      (counter :value (decf *counter*)))))
+
+;;; Routes
+
 (defparameter *index-app* (jg:make-app))
 
 (utils:register-routes
  *index-app*
- `((:method :GET :path "/" :handler ,#'index)))
+ `((:method :GET  :path "/"                 :handler ,#'index)
+   (:method :POST :path "/counter/increase" :handler ,#'increase)
+   (:method :POST :path "/counter/decrease" :handler ,#'decrease)))