diff -r 390514bce78a -r fca4100c1733 src/pyams_portal/zmi/templates/template-properties.pt
--- a/src/pyams_portal/zmi/templates/template-properties.pt	Fri Mar 26 16:32:52 2021 +0100
+++ b/src/pyams_portal/zmi/templates/template-properties.pt	Thu Aug 05 09:27:48 2021 +0200
@@ -82,6 +82,20 @@
 							<i></i><span i18n:translate="">Use custom local template</span>
 						</label>
 					</div>
+					<div class="form-group">
+						<div>
+							<div class="control-label col-md-3">
+								<span i18n:translate="">Custom CSS class</span>
+							</div>
+							<div class="col-md-3">
+								<div class="input">
+									<input type="text"
+										   name="template_css_class"
+										   value="${view.template_css_class}" />
+								</div>
+							</div>
+						</div>
+					</div>
 				</fieldset>
 			</div>
 			<footer tal:condition="view.actions and (view.is_dialog or (view.mode == 'input'))">