diff --git a/astro.config.mjs b/astro.config.mjs
index a3e04bc..a46126c 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -20,6 +20,10 @@ export default defineConfig({
   },
   integrations: [sitemap(), svelte()],
   markdown: {
+    syntaxHighlight: {
+      type: 'shiki',
+      excludeLangs: ['mermaid', 'math'],
+    },
     rehypePlugins: [rehypeMermaid],
   },
 })
diff --git a/src/styles/global.css b/src/styles/global.css
index f9a63a0..6a1bdc5 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -49,6 +49,13 @@ td code {
   background: rgba(127, 127, 127, 0.12);
 }
 
+article svg.flowchart,
+article svg[class*="flowchart"],
+article svg[id^="mermaid-"] {
+  display: block;
+  margin: 1.5rem auto;
+}
+
 html {
   font-family: "Maple Mono", "Maple Mono CN", monospace;
   background-color: #ffffff;