diff --git a/app/style.css b/app/style.css
index 3469578..ac4fabb 100644
--- a/app/style.css
+++ b/app/style.css
@@ -58,6 +58,11 @@ input, textarea {
     font-family: "맑은 고딕", "Malgun Gothic", "Segoe UI", Calibri, Arial, Sans-Serif;
 }
 
+#app {
+    width: 100%;
+    height: 100%;
+}
+
 .compatible-css3 {
     behavior: url(app/assets/htc/PIE.htc);
 }