diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 3d4f117644f..789290a8226 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -791,7 +791,7 @@ class Form
 
 		// Warning: if you set submit button to disabled, post using 'Enter' will no more work if there is no another input submit. So we add a hidden button
 		$ret .= '<input type="submit" name="confirmmassactioninvisible" style="display: none" tabindex="-1">'; // Hidden button BEFORE so it is the one used when we submit with ENTER.
-		$ret .= '<input type="submit" disabled name="confirmmassaction"'.(empty($conf->use_javascript_ajax) ? '' : ' style="display: none"').' class="button small'.(empty($conf->use_javascript_ajax) ? '' : ' hideobject').' '.$name.' '.$name.'confirmed" value="'.dol_escape_htmltag($langs->trans("Confirm")).'">';
+		$ret .= '<input type="submit" disabled name="confirmmassaction"'.(empty($conf->use_javascript_ajax) ? '' : ' style="display: none"').' class="button smallpaddingimp'.(empty($conf->use_javascript_ajax) ? '' : ' hideobject').' '.$name.' '.$name.'confirmed" value="'.dol_escape_htmltag($langs->trans("Confirm")).'">';
 		$ret .= '</div>';
 
 		if (!empty($conf->use_javascript_ajax)) {