Feat: add code function

functions/code.typ

@@ -0,0 +1 @@
+#let code = raw.with(block: true)

module.typ

@@ -1,4 +1,6 @@
-#let document(
+#import "functions/code.typ": code
+
+#let default(
   title: "This is a title",
   authors: ((
       name: "Yi-Ting Shih",
@@ -11,6 +13,8 @@
   set page(
     paper: "a4",
     margin: (x: 1.8cm, y: 1.5cm),
+    header: align(right, title),
+    numbering: "1",
   )
   set text(
     font: "Libertinus serif",
@@ -30,11 +34,20 @@
     numbering: "1."
   )
   
-  // Code section default
+  // Raw default
   show raw: set text(
     font: "Consolas",
-    size: 8pt
+    size: 8pt,
   )
+  // Code section default
+  show raw.where(block: true): self => {
+    block(
+      fill: luma(240),
+      inset: 8pt,
+      radius: 2pt,
+      self
+    )
+  }
 
   { // Title
     set align(center)