diff --git a/_static/css/agaric.css b/_static/css/agaric.css
new file mode 100644
index 0000000..17d621d
--- /dev/null
+++ b/_static/css/agaric.css
@@ -0,0 +1,8 @@
+.wy-side-nav-search {
+  background-color: #26599b;
+}
+
+.wy-side-nav-search .wy-dropdown > a img.logo,
+.wy-side-nav-search > a img.logo {
+  width: 12rem;
+}
diff --git a/conf.py b/conf.py
index 493706c..44e159e 100644
--- a/conf.py
+++ b/conf.py
@@ -88,12 +88,21 @@ pygments_style = 'sphinx'
 # a list of builtin themes.
 #
 html_theme = 'sphinx_rtd_theme'
+html_logo = 'images/agaric-logo-horizontal-white.svg'
+html_css_files = [
+    'css/agaric.css',
+]
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
 #
-# html_theme_options = {}
+# TIP: If it starts with `html_` it belongs directly as a conf.py option and
+# NOT in html_theme_options.
+html_theme_options = {
+    'canonical_url': 'https://docs.agaric.coop/',
+    'logo_only': True,
+}
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
diff --git a/images/agaric-logo-horizontal-white.svg b/images/agaric-logo-horizontal-white.svg
new file mode 100644
index 0000000..380f3cd
--- /dev/null
+++ b/images/agaric-logo-horizontal-white.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/images/agaric-logo-horizontal.png b/images/agaric-logo-horizontal.png
new file mode 100644
index 0000000..76d286d
Binary files /dev/null and b/images/agaric-logo-horizontal.png differ
diff --git a/agaric-logo-horizontal.svg b/images/agaric-logo-horizontal.svg
similarity index 100%
rename from agaric-logo-horizontal.svg
rename to images/agaric-logo-horizontal.svg
diff --git a/index.md b/index.md
index 042b656..f12b1eb 100644
--- a/index.md
+++ b/index.md
@@ -1,6 +1,6 @@
 # Welcome to Agaric Collective's documentation!
 
-```{image} agaric-logo-horizontal.svg
+```{image} images/agaric-logo-horizontal.svg
 :width: 240px
 :alt: Agaric logo (two mushrooms reminiscent of the cooperative trees)
 :align: center