diff --git a/htdocs/public/opensurvey/studs.php b/htdocs/public/opensurvey/studs.php
index 8cc9a82ad3c..3f19fb68b7e 100644
--- a/htdocs/public/opensurvey/studs.php
+++ b/htdocs/public/opensurvey/studs.php
@@ -535,7 +535,7 @@ while ($compteur < $num)
 	// Button edit at end of line
 	if ($compteur != $ligneamodifier && $mod_ok)
 	{
-		print '<td class="casevide"><input type="submit" class="button" name="modifierligne'.$compteur.'" value="'.dol_escape_htmltag($langs->trans("Edit")).'"></td>'."\n";
+		print '<td class="casevide"><input type="submit" class="button smallpaddingimp" name="modifierligne'.$compteur.'" value="'.dol_escape_htmltag($langs->trans("Edit")).'"></td>'."\n";
 	}
 
 	//demande de confirmation pour modification de ligne