diff --git a/config.yml b/config.yml
index bb18bed..d60ed32 100644
--- a/config.yml
+++ b/config.yml
@@ -1,6 +1,6 @@
 baseURL: "http://blog.morgan.kr"
 title: Morgan's Blog
-theme: "oldtheme"
+theme: "mytheme"
 
 buildDrafts: false
 buildFuture: false
diff --git a/themes/mytheme/layouts/_default/single.html b/themes/mytheme/layouts/_default/single.html
index 50b5e99..e5cda52 100644
--- a/themes/mytheme/layouts/_default/single.html
+++ b/themes/mytheme/layouts/_default/single.html
@@ -1,5 +1,5 @@
 {{ define "main" }}
-<div class="max-w-7xl mx-auto bg-white p-4 sm:p-10 pt-8 sm:pt-16 rounded-lg shadow-xl">
+<div class="mx-auto bg-white p-4 sm:p-10 pt-8 sm:pt-16 rounded-lg shadow-xl sm:max-w-7xl">
   <div class="mb-6 sm:mb-10 text-center">
     <h1 class="text-2xl sm:text-3xl font-bold mb-4 sm:mb-6 text-black">{{ .Title }}</h1>
     <div class="text-base sm:text-lg md:text-2xl">