diff --git a/docs/03extras/04website/02docusaurus/index.mdx b/docs/03extras/04website/02docusaurus/index.mdx
index c944a2a01..f0ded84b8 100644
--- a/docs/03extras/04website/02docusaurus/index.mdx
+++ b/docs/03extras/04website/02docusaurus/index.mdx
@@ -6,6 +6,15 @@ import InteractiveCodeEditor from "@site/src/components/InteractiveCodeEditor/In
 import installDocusaurus from "./install_docusaurus.mp4";
 import editDocusaurus from "./edit_docusaurus.mp4";
 import LifeGame from "@site/src/components/LifeGame/LifeGame";
+export const defaultMathValue = `\
+$a^2 + b^2 = c^2$
+$$
+  \\frac{\\pi}{2} =
+  \\left( \\int_{0}^{\\infty} \\frac{\\sin x}{\\sqrt{x}} dx \\right)^2 =
+  \\sum_{k=0}^{\\infty} \\frac{(2k)!}{2^{2k}(k!)^2} \\frac{1}{2k+1} =
+  \\prod_{k=1}^{\\infty} \\frac{4k^2}{4k^2 - 1}
+$$\
+`;
 
 # Docusaurus のプロジェクトの作成方法
 
@@ -137,9 +146,7 @@ import LifeGame from "@site/src/components/LifeGame/LifeGame";
 
     <InteractiveCodeEditor
       language="markdown"
-      defaultValue={
-        "$a^2 + b^2 = c^2$\n$$\n\\frac{\\pi}{2} =\n \\left( \\int_{0}^{\\infty} \\frac{\\sin x}{\\sqrt{x}} dx \\right)^2 =\n \\sum_{k=0}^{\\infty} \\frac{(2k)!}{2^{2k}(k!)^2} \\frac{1}{2k+1} =\n \\prod_{k=1}^{\\infty} \\frac{4k^2}{4k^2 - 1}\n$$"
-      }
+      defaultValue={defaultMathValue}
     />
 
 :::