diff --git a/web/docs/docusaurus.config.js b/web/docs/docusaurus.config.js
--- a/web/docs/docusaurus.config.js
+++ b/web/docs/docusaurus.config.js
@@ -9,6 +9,11 @@
     organizationName: 'bitcoin-abc',
     projectName: 'cashtab',
     themeConfig: {
+        colorMode: {
+            // "light" | "dark"
+            defaultMode: 'dark',
+        },
+        image: 'img/twitter-card.jpg',
         navbar: {
             title: 'Cashtab',
             logo: {
diff --git a/web/docs/static/img/twitter-card.jpg b/web/docs/static/img/twitter-card.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

literal 0
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