diff --git a/storage/src/main/kotlin/com/few/storage/document/service/ConvertDocumentService.kt b/storage/src/main/kotlin/com/few/storage/document/service/ConvertDocumentService.kt
index fddf3582a..0922e7e79 100644
--- a/storage/src/main/kotlin/com/few/storage/document/service/ConvertDocumentService.kt
+++ b/storage/src/main/kotlin/com/few/storage/document/service/ConvertDocumentService.kt
@@ -4,6 +4,7 @@ import org.commonmark.parser.Parser
 import org.commonmark.renderer.html.HtmlRenderer
 import org.jsoup.Jsoup
 import org.springframework.stereotype.Service
+import java.io.File
 
 @Service
 class ConvertDocumentService {
@@ -17,7 +18,27 @@ class ConvertDocumentService {
     fun mdToHtml(md: String): String {
         val html = Jsoup.parse(ARTICLE)
         val article = htmlRenderer.render(parser.parse(md))
-        html.body().append(article)
-        return html.toString()
+        html.getElementsByTag("article").append(article)
+        html.getElementsByTag("h1").forEach {
+            it.addClass("sub1-semibold")
+        }
+        html.getElementsByTag("h2").forEach {
+            it.addClass("sub1-semibold top bottom 5px")
+        }
+        html.getElementsByTag("h3").forEach {
+            it.addClass("sub1-semibold")
+        }
+        html.getElementsByTag("img").forEach {
+            it.addClass("!max-h-[260px] object-contain")
+        }
+        return html.body().html()
     }
+}
+
+fun main() {
+    val convertDocumentService = ConvertDocumentService()
+    val file =
+        File("/Users/jongjun/Documents/Code/Spring/24th-Web-Team-1-BE/storage/src/main/resources/test.md")
+    val md = file.readText()
+    println(convertDocumentService.mdToHtml(md))
 }
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