diff --git a/docs.it4i/src/css.css b/docs.it4i/src/css.css
new file mode 100644
index 0000000000000000000000000000000000000000..7a9c4e5dbdeee84d1c6976120407d0c6a8552752
--- /dev/null
+++ b/docs.it4i/src/css.css
@@ -0,0 +1,10 @@
+a:not([href*="//"]) {
+    /* CSS for internal links */
+}
+
+a[href*="//"] {
+    /*CSS for external links */
+    background: transparent url("/img/external.png") no-repeat right 0px top 1px;
+    background-size: 12px;
+    padding: 1px 16px 1px 0px;
+}
diff --git a/mkdocs.yml b/mkdocs.yml
index 3ce548ba86c79b2c53c4591775b195d54b9b4d35..9a706c687d66befab5aa43d5474d5d1f598b27d6 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -2,6 +2,8 @@ site_name: IT4Innovations Documentation
 theme_dir: 'material'
 docs_dir: docs.it4i
 
+extra_css: 'docs.it4i/src/css.css'
+
 # Repository
 repo_name: it4i-admins/docs.it4i
 repo_url: https://gitlab.it4i.cz/it4i-admins/docs.it4i