diff --git a/docs/conf.py b/docs/conf.py
index 2498a8b..569f9cf 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -20,6 +20,7 @@
     "sphinx.ext.autodoc",
     "sphinx.ext.intersphinx",
     "sphinx.ext.extlinks",
+    "sphinx_sitemap",
 ]
 
 extlinks = {
@@ -31,6 +32,9 @@
     "python": ("https://docs.python.org/3", None),
 }
 
+html_baseurl = "https://captcha.lepture.com/"
+sitemap_url_scheme = "{link}"
+
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
 
@@ -49,7 +53,7 @@
 #
 html_theme = 'shibuya'
 html_theme_options = {
-    "dark_code": True,
+    "accent_color": "green",
     "light_logo": "_static/light-logo.svg",
     "dark_logo": "_static/dark-logo.svg",
     "twitter_site": 'lepture',
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 76fa319..a0e574f 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,3 @@
 sphinx
+sphinx-sitemap
 shibuya