--- /dev/null
+<?php
+
+/**
+ * @file
+ * Theme settings form for {{ name }} theme.
+ */
+
+/**
+ * Implements hook_form_system_theme_settings_alter().
+ */
+function {{ machine_name }}_form_system_theme_settings_alter(&$form, &$form_state) {
+
+ $form['{{ machine_name }}'] = [
+ '#type' => 'details',
+ '#title' => t('{{ name }}'),
+ '#open' => TRUE,
+ ];
+
+ $form['{{ machine_name }}']['font_size'] = [
+ '#type' => 'number',
+ '#title' => t('Font size'),
+ '#min' => 12,
+ '#max' => 18,
+ '#default_value' => theme_get_setting('font_size'),
+ ];
+
+}