diff --git a/script.js b/script.js
index 39db513..255136b 100644
--- a/script.js
+++ b/script.js
@@ -124,7 +124,23 @@ addEventListener('DOMContentLoaded', () => {
     }
 
     { // format info
-      // TODO
+      // ctx.fillStyle = "rgba(63, 149, 224, 0.5)"
+      ctx.fillStyle = "rgba(63, 203, 224, 0.5)"
+
+      ctx.fillRect(0, idSize, idSize, scale)
+      ctx.fillRect(idSize, 0, scale, idSize + scale)
+      ctx.fillRect(idSize, canvas.height - idSize, scale, idSize)
+      ctx.fillRect(canvas.width - idSize, idSize, idSize, scale)
+    }
+
+    if (ver >= 7) { // version info
+      ctx.fillStyle = "rgba(63, 224, 171, 0.5)"
+
+      const verWidth = 3 * scale
+      const verHeight = 6 * scale
+      const verBeginPos = canvas.width - idSize - verWidth
+      ctx.fillRect(verBeginPos, 0, verWidth, verHeight)
+      ctx.fillRect(0, verBeginPos, verHeight, verWidth)
     }
   })