diff --git a/source/conf.py b/source/conf.py
index 6662fa38c74012bcffc43f0ff22099d733b01881..9e287833eb031b65b2adf533f50950712b431045 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -13,7 +13,22 @@ author = "Odair M."
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
 
-extensions = []
+extensions = [
+    "sphinx.ext.duration",
+    "sphinx.ext.doctest",
+    "sphinx.ext.autodoc",
+    "sphinx.ext.autosummary",
+    "sphinx.ext.intersphinx",
+]
+
+intersphinx_mapping = {
+    "python": ("https://docs.python.org/3/", None),
+    "sphinx": ("https://www.sphinx-doc.org/en/master/", None),
+}
+
+intersphinx_disabled_domains = ["std"]
+
+
 
 templates_path = ["_templates"]
 exclude_patterns = []
@@ -23,5 +38,6 @@ language = "pt"
 # -- Options for HTML output -------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
-html_theme = "alabaster"
+html_theme = "sphinx_rtd_theme"
 html_static_path = ["_static"]
+epub_show_urls = "footnote"