diff --git a/hwe/ts/common_deprecated.ts b/hwe/ts/common_deprecated.ts
index 90131575..3aa4e772 100644
--- a/hwe/ts/common_deprecated.ts
+++ b/hwe/ts/common_deprecated.ts
@@ -11,21 +11,17 @@ import { nl2br } from "@util/nl2br";
 import jQuery from "jquery";
 
 import "@scss/common_legacy.scss";
+import { insertCustomCSS } from "./util/customCSS";
+import { htmlReady } from "./util/htmlReady";
 
 exportWindow(jQuery, '$');
 exportWindow(jQuery, 'jQuery');
 
-jQuery(function ($) {
+htmlReady(function(){
     initTooltip();
     activateFlip();
-
-    const customCSS = localStorage.getItem('sam_customCSS');
-    if (customCSS) {
-        const $style = $('<style type="text/css"></style>');
-        $style.text(customCSS);
-        $style.appendTo($('head'));
-    }
-});
+    insertCustomCSS();
+})
 
 /**
  * {0}, {1}, {2}형태로 포맷해주는 함수
diff --git a/hwe/ts/legacy/main.ts b/hwe/ts/legacy/main.ts
index c681ac97..d72a9aae 100644
--- a/hwe/ts/legacy/main.ts
+++ b/hwe/ts/legacy/main.ts
@@ -6,6 +6,7 @@ import { initTooltip } from './initTooltip';
 import { exportWindow } from '@/util/exportWindow';
 import { reloadWorldMap } from '@/map';
 import { refreshMsg } from '@/msg';
+import { insertCustomCSS } from '@/util/customCSS';
 
 exportWindow(jQuery, '$');
 
@@ -50,12 +51,7 @@ htmlReady(() => {
         void refreshMsg();
     }, 5000);
 
-    const customCSS = localStorage.getItem('sam_customCSS');
-    if (customCSS) {
-        const styleEl = document.createElement('style');
-        styleEl.innerHTML = customCSS;
-        document.head.appendChild(styleEl);
-    }
+    insertCustomCSS();
 });
 
 (() => {
diff --git a/hwe/ts/util/customCSS.ts b/hwe/ts/util/customCSS.ts
new file mode 100644
index 00000000..29e55eff
--- /dev/null
+++ b/hwe/ts/util/customCSS.ts
@@ -0,0 +1,9 @@
+export function insertCustomCSS(key = 'sam_customCSS'){
+    const customCSS = localStorage.getItem(key);
+    if (customCSS) {
+        const css = document.createElement('style');
+        css.innerHTML = customCSS;
+        console.log(css);
+        document.getElementsByTagName('head')[0].appendChild(css);
+    }
+}