diff --git a/src/lib/components/Markdown.css b/src/lib/components/Markdown.css
index c93143a..8e15d81 100644
--- a/src/lib/components/Markdown.css
+++ b/src/lib/components/Markdown.css
@@ -161,13 +161,8 @@
             width: 60%;
         }
     }
-    & .katex-html {
-        display: none;
-    }
-    & .katex-display {
-        & math {
+    & math[display="block"] {
             margin: 1rem;
             font-size: 1.5rem;
-        }
     }
 }
\ No newline at end of file
diff --git a/src/lib/components/Markdown.svelte b/src/lib/components/Markdown.svelte
index ebad218..4428357 100644
--- a/src/lib/components/Markdown.svelte
+++ b/src/lib/components/Markdown.svelte
@@ -24,7 +24,7 @@
         .use(remarkmath)     // 数式
         .use(remarkRehype, {allowDangerousHtml: true})
         .use(rehypeslug)     // headingにidを設定
-        .use(rehypeKatex)    // 数式
+        .use(rehypeKatex, {output:'mathml'})    // 数式
         .use(rehypeHighlight)// Syntax highlight
         .use(rehypeExternalLinks, {target:'_blank', rel:['noreferrer','noopener']})// 外部サイトを新規タブで開く
         .use(rehypeStringify, {allowDangerousHtml: true})