diff --git a/htdocs/admin/tools/dolibarr_export.php b/htdocs/admin/tools/dolibarr_export.php
index 82f73b8066c..fb9eababad8 100644
--- a/htdocs/admin/tools/dolibarr_export.php
+++ b/htdocs/admin/tools/dolibarr_export.php
@@ -446,7 +446,7 @@ print "\n";
 
 
 <br>
-<div align="center"><input type="submit" class="button"
+<div class="center"><input type="submit" class="button"
 	value="<?php echo $langs->trans("GenerateBackup") ?>" id="buttonGo" /><br>
 <br>
 
@@ -575,7 +575,7 @@ print "\n";
 
 ?>
 <br>
-<div align="center"><input type="submit" class="button"
+<div class="center"><input type="submit" class="button"
 	value="<?php echo $langs->trans("GenerateBackup") ?>" id="buttonGo" /><br>
 <br>
 </div>