diff --git a/themes/plain/layouts/_default/baseof.html b/themes/plain/layouts/_default/baseof.html
index e646734..b3ab01a 100644
--- a/themes/plain/layouts/_default/baseof.html
+++ b/themes/plain/layouts/_default/baseof.html
@@ -12,6 +12,11 @@
   <meta name="keywords" content="{{ if .IsPage}}{{ range $index, $tag := .Params.tags }}{{ $tag }},{{ end }}{{ else }}{{ range $plural, $terms := .Site.Taxonomies }}{{ range $term, $val := $terms }}{{ printf "%s," $term }}{{ end }}{{ end }}{{ end }}" />
 
   {{- partial "style.html" . -}}
+
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.10/dist/katex.min.css" integrity="sha384-wcIxkf4k558AjM3Yz3BBFQUbk/zgIYC2R0QpeeYb+TwlBVMrlgLqwRjRtGZiK7ww" crossorigin="anonymous">
+  <script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.10/dist/katex.min.js" integrity="sha384-hIoBPJpTUs74ddyc4bFZSM1TVlQDA60VBbJS0oA934VSz82sBx1X7kSx2ATBDIyd" crossorigin="anonymous"></script>
+  <script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.10/dist/contrib/auto-render.min.js" integrity="sha384-43gviWU0YVjaDtb/GhzOouOXtZMP/7XUzwPTstBeZFe/+rCMvRwr4yROQP43s0Xk" crossorigin="anonymous"
+    onload="renderMathInElement(document.body);"></script>
 </head>
 <body>
   <header>
@@ -36,4 +41,4 @@
   <footer>
   </footer>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/themes/plain/layouts/partials/style.html b/themes/plain/layouts/partials/style.html
index 13621f8..33b3ff9 100644
--- a/themes/plain/layouts/partials/style.html
+++ b/themes/plain/layouts/partials/style.html
@@ -1,7 +1,7 @@
 <link rel="stylesheet" href="/css/syntax.css">
 <style>
   body {
-    font-family: sans-serif;
+    font-family: "Noto Sans", "Pretendard", sans-serif;
     font-size: 18px;
     margin: auto;
     padding: 20px;
