Index: src/views/pages/admin-seo.ejs
===================================================================
--- src/views/pages/admin-seo.ejs	(revision 1ff004363790da4fd47e4c572ebaa3bb8663d228)
+++ src/views/pages/admin-seo.ejs	(revision 5e524483d9c634a2c984c8f8613fcdeac45ad3ab)
@@ -42,4 +42,12 @@
         <span><%= t('aseo.og_image') %> <small class="form-hint-inline">— <%= t('aseo.og_image_hint') %></small></span>
         <input type="text" name="og_image_default" value="<%= site.og_image_default || '' %>" placeholder="https://yourdomain.com/share.jpg" maxlength="500">
+      </label>
+      <label>
+        <span><%= t('aseo.og_theme') %> <small class="form-hint-inline">— <%= t('aseo.og_theme_hint') %></small></span>
+        <select name="og_theme">
+          <option value="" <%= !site.og_theme ? 'selected' : '' %>><%= t('aseo.og_theme_auto') %></option>
+          <option value="light" <%= site.og_theme === 'light' ? 'selected' : '' %>><%= t('aseo.og_theme_light') %></option>
+          <option value="dark" <%= site.og_theme === 'dark' ? 'selected' : '' %>><%= t('aseo.og_theme_dark') %></option>
+        </select>
       </label>
       <label>