diff --git a/Activity_PHP/calendar/calendar.php b/Activity_PHP/calendar/calendar.php
index 373787c..e71fd87 100644
--- a/Activity_PHP/calendar/calendar.php
+++ b/Activity_PHP/calendar/calendar.php
@@ -29,7 +29,7 @@ $monthName = $months[$month];
    <link rel="icon" href="favicon.ico" type="image/x-icon">
 </head>
 <body>
-   <main>
+   <main class="main-calendar">
       <h1>Calendar</h1>
         <table>
             <tr>
@@ -126,8 +126,36 @@ $monthName = $months[$month];
                }
                ?>
             </tr>
-        </table>
-    </main>
-    <a href="index.php">back -></a>
+         </table>
+   </main>
+      <main>
+      <a href="index.php" class="a-back">back -></a>
+
+      <form id="formMois" method="post">
+         <input type="hidden" id="year" name="year" value="<?php echo $year; ?>">
+         <input type="hidden" id="month" name="month" value="<?php echo $month; ?>">
+
+         <input type="submit" onclick="updateMonth(-1)" value="<-" class="btn">
+         <input type="submit" onclick="updateMonth(1)" value="->" class="btn">
+      </form>
+   </main>
+
+   <script>
+   function updateMonth(offset) {
+      var month = parseInt(document.getElementById("month").value) + offset;
+      var year = parseInt(document.getElementById("year").value);
+      if (month === 0) {
+         month = 12;
+         year -= 1;
+      }
+      if (month === 13) {
+         month = 1;
+         year += 1;
+      }
+
+      document.getElementById("month").value = month;
+      document.getElementById("year").value = year;
+   }
+</script>
 </body>
 </html>
\ No newline at end of file
diff --git a/Activity_PHP/calendar/del_rappel.php b/Activity_PHP/calendar/del_rappel.php
new file mode 100644
index 0000000..fd6dd05
--- /dev/null
+++ b/Activity_PHP/calendar/del_rappel.php
@@ -0,0 +1,8 @@
+<?php
+$callback = $_POST['callback'];
+
+setcookie("$callback", '', time() - 3600, '/');
+
+header("Location: index.php");
+exit;
+?>
\ No newline at end of file
diff --git a/Activity_PHP/calendar/index.php b/Activity_PHP/calendar/index.php
index b942237..46babc5 100644
--- a/Activity_PHP/calendar/index.php
+++ b/Activity_PHP/calendar/index.php
@@ -11,7 +11,7 @@
     <header>
         <h1>Calendar</h1>
         <form method="post" action="calendar.php">
-            <label for="">Month :</label>
+            <label for="month">Month :</label>
             <select name="month">
                 <?php
                 $months = [
@@ -36,7 +36,7 @@
                 ?>
             </select>
 
-            <label for="">Year :</label>
+            <label for="year">Year :</label>
             <select name="year">
             <?php
             for ($i = date("Y")-100; $i <= date("Y")+100; $i++) {
@@ -48,7 +48,7 @@
             <button type="submit">Validate</button>
         </form>
     </header>
-    <main>
+    <main class="first-main">
         <section>
             <h2>Welcome to the calendar generator</h2>
             <p>This site allows you to generate calendars for different months according to the year you specify. Enter the month and year in the form above and click on "Validate" to see the corresponding calendar.</p>
@@ -64,9 +64,9 @@
         </section>
     </main>
     <main>
-        <h2>Add a rappel :</h2>
+        <h2>Add a callback :</h2>
         <form method="post" action="create_rappel.php">
-            <label for="">Day :</label>
+            <label for="day">Day :</label>
             <select name="day">
                 <?php
                 for ($j = 1; $j <= 31; $j++) {
@@ -76,7 +76,7 @@
                 ?>
             </select>
 
-            <label for="">Month :</label>
+            <label for="month">Month :</label>
             <select name="month">
                 <?php
                 foreach ($months as $value => $label) {
@@ -86,7 +86,7 @@
                 ?>
             </select>
 
-            <label for="">Year :</label>
+            <label for="year">Year :</label>
             <select name="year">
                 <?php
                 for ($i = date("Y")-100; $i <= date("Y")+100; $i++) {
@@ -96,9 +96,32 @@
                 ?>
             </select>
 
-            <label for="rappel">Rappel :</label>
+            <label for="rappel">Callback :</label>
             <input type="text" name="rappel" required>
-            <button type="submit">Validate</button>
+            <button type="submit">add</button>
+        </form>
+    </main>
+    <main>
+        <h2>Delete a callback :</h2>
+        <form method="post" action="del_rappel.php">
+            <label for="callback">Callback :</label>
+            <select name="callback" class="sup-callback">
+                <?php
+                foreach ($_COOKIE as $nom_cookie => $valeur_cookie) {
+                    
+                    $cut = explode("-", $nom_cookie);
+   
+                    if (count($cut) >= 3) {
+                       $rappelday = $cut[0];
+                       $rappelmonth = $cut[1];
+                       $rappelyear = $cut[2];
+                    } else {}
+
+                    echo "<option value='$nom_cookie'>$rappelday/$rappelmonth/$rappelyear : $valeur_cookie</option>";
+                }
+                ?>
+            </select>
+            <button type="submit">Delete</button>
         </form>
     </main>
 </body>
diff --git a/Activity_PHP/calendar/style.css b/Activity_PHP/calendar/style.css
index 7b80d2e..9a42ae6 100644
--- a/Activity_PHP/calendar/style.css
+++ b/Activity_PHP/calendar/style.css
@@ -37,6 +37,10 @@ header {
    color: #fff;
    text-align: center;
    padding: 1em 0;
+   position: fixed;
+   width: 100%;
+   top: 0;
+   left: 0;
 }
 
 header h1 {
@@ -52,6 +56,10 @@ form label {
    margin-right: 10px;
 }
 
+.sup-callback {
+   width: 300px;
+}
+
 form input,
 form select {
    width: 100px;
@@ -59,12 +67,19 @@ form select {
    margin-right: 10px;
 }
 
-form button {
+button,
+a,
+.btn {
    padding: 7px 15px;
    background-color: #292929;
    color: #fff;
    border: none;
    cursor: pointer;
+   text-decoration: none;
+}
+
+.first-main {
+   margin-top: 150px;
 }
 
 main {
@@ -86,3 +101,7 @@ main h2 {
 main p {
    color: #555;
 }
+
+.main-calendar {
+   min-height: 500px;
+}
\ No newline at end of file
