diff --git a/theme-settings.php b/theme-settings.php
index 9cffe3c..35e01c5 100644
--- a/theme-settings.php
+++ b/theme-settings.php
@@ -268,33 +268,42 @@ function bulma_form_system_theme_settings_alter(&$form, FormStateInterface $form
   // Bulmaswatch settings.
   $form['bulma_bulmaswatch'] = [
     '#type' => 'details',
-    '#title' => t('Bulmaswatch Theme'),
-    '#description' => t('Contains settings for custom themes provided by Bulmaswatch; see <a href="@docs">documentation</a>', [
-      '@docs' => Url::fromUri('https://jenil.github.io/bulmaswatch/',
-        ['attributes' => ['target' => '_blank']])
-        ->toString(),
+    '#title' => t('Bulma Theme'),
+    '#description' => t('Select a custom theme provided by Bulmaswatch; see <a href=":docs" target="_blank">documentation</a>.', [
+      ':docs' => 'https://jenil.github.io/bulmaswatch',
     ]),
-    // Default access to FALSE.
-    '#access' => FALSE,
-  ];
-
-  $form['bulma_bulmaswatch']['bulma_bulmaswatch_theme'] = [
-    '#type' => 'select',
-    '#title' => t('Theme'),
-    '#description' => t('Select a custom theme.'),
-    '#options' => [
-      'default' => t('Default'),
-    ],
-    '#default_value' => theme_get_setting('bulma_bulmaswatch_theme'),
   ];
 
   if ($themes = Bulmaswatch::getThemes()) {
-    $form['bulma_bulmaswatch']['#access'] = TRUE;
+    $form['bulma_bulmaswatch']['bulma_bulmaswatch_theme'] = [
+      '#type' => 'select',
+      '#title' => t('Theme'),
+      '#options' => [
+        'default' => t('Default'),
+      ],
+      '#default_value' => theme_get_setting('bulma_bulmaswatch_theme'),
+    ];
+
     foreach ($themes as $machine_name => $theme) {
-      $form['bulma_bulmaswatch']['bulma_bulmaswatch_theme']['#options'][$machine_name] = t('%name: %description', ['%name' => $theme['name'], '%description' => $theme['description']]);
+      $form['bulma_bulmaswatch']['bulma_bulmaswatch_theme']['#options'][$machine_name] = t('@name: @description', ['@name' => $theme['name'], '@description' => $theme['description']]);
+      $form['bulma_bulmaswatch']['bulma_bulmaswatch_theme_preview_' . $machine_name] = [
+        '#type' => 'item',
+        '#markup' => '<p>' . t('<a href=":preview" target="_blank">Preview</a> the %name theme.', [':preview' => $theme['preview'], '%name' => $theme['name']]) . '</p>',
+        '#states' => [
+          'visible' => [
+            'select[name="bulma_bulmaswatch_theme"]' => ['value' => $machine_name],
+          ],
+        ],
+      ];
     }
     $form['#submit'][] = 'bulma_form_system_theme_settings_submit';
   }
+  else {
+    $form['bulma_bulmaswatch']['bulma_bulmaswatch_theme_message'] = [
+      '#type' => 'item',
+      '#markup' => '<p>' . t('To enable support for custom themes, <a href=":download" target="_blank">download</a> a Bulmaswatch release and extract it to <code>libraries/bulmaswatch</code> so that the README.md file is at <code>libraries/bulmaswatch/README.md</code>.', [':download' => 'https://github.com/jenil/bulmaswatch/releases']) . '</p>',
+    ];
+  }
 
 }