diff --git a/html/css/calendar-blue.css b/html/css/calendar-blue.css
index b403b9f6b..85172b05e 100644
--- a/html/css/calendar-blue.css
+++ b/html/css/calendar-blue.css
@@ -19,8 +19,7 @@ div.calendar { position: relative; z-index:13; }
   border-radius: 0px;
 }
 
-.calendar .nav1 {
-  #background: #778 url(menuarrow.gif) no-repeat 100% 100%;
+.calendar .navcalendar {
 }
 
 .calendar thead .title { /* This holds the current "month, year" */
diff --git a/html/index.php b/html/index.php
index 5be012e45..4f2b070ca 100644
--- a/html/index.php
+++ b/html/index.php
@@ -246,8 +246,8 @@ if (isset($_REQUEST['reconnect'])&&isset($_REQUEST['backurl']))
                     <?php
                 endif;
                 ?>  
-                <div class="form-group  row">
-                    <INPUT TYPE="SUBMIT"  class="button" NAME="login" value="Se connecter">
+                <div class="form-group  row  justify-content-center">
+                    <INPUT TYPE="SUBMIT"  class="button" NAME="login" value="se connecter">
                 </div>
 
             </form>
diff --git a/html/js/calendar.js b/html/js/calendar.js
index 223909a49..a12bb03ad 100644
--- a/html/js/calendar.js
+++ b/html/js/calendar.js
@@ -756,7 +756,7 @@ Calendar.prototype.create = function (_par) {
 		cell.colSpan = cs;
 		cell.className = "button";
 		if (navtype != 0 && Math.abs(navtype) <= 2)
-			cell.className += " nav";
+			cell.className += " navcalendar";
 		Calendar._add_evs(cell);
 		cell.calendar = cal;
 		cell.navtype = navtype;