diff --git a/.editorconfig b/.editorconfig
index a931fa7..6528b8a 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -8,6 +8,10 @@ indent_style = space
 insert_final_newline = true
 trim_trailing_whitespace = true
 
+[*.css]
+indent_size = 4
+indent_style = space
+
 [*.md]
 indent_size = 4
 indent_style = space
diff --git a/assets/custom.css b/assets/custom.css
new file mode 100644
index 0000000..6514ba0
--- /dev/null
+++ b/assets/custom.css
@@ -0,0 +1,2 @@
+.centered { text-align: center; }
+.pad-side { padding: 0 .25em; }
diff --git a/config.yaml b/config.yaml
index 1f8477e..eafe777 100644
--- a/config.yaml
+++ b/config.yaml
@@ -39,7 +39,7 @@ params:
   # Favicon file (relative to baseURL - place below static or assets folder)
   favicon: favicon.png
   # Custom css file (relative to baseURL - place below static or assets folder)
-  css: null
+  css: custom.css
 
   # Define formatting of dates
   # (optional, falls back to RFC822 format if not set)