diff --git a/main.js b/main.js
index acecd24..2b30d08 100644
--- a/main.js
+++ b/main.js
@@ -108,7 +108,7 @@ function errorHandling(e, err) {
       else message += ": 다시 한 번 시도해주세요.";
     } else if (errorCode.startsWith('N2MT')) {
       message = "번역 오류";
-      if (errorCode == "N2MT08") message += ": 문장이 너무 길어요!";
+      if (errorCode == "N2MT08") message += ": 문장이 너무 길어요!"; // up to 5000 characters.
       else message += ": 다시 한 번 시도해주세요.";
     }
   }
diff --git a/views/window.js b/views/window.js
index 422643c..52b16d4 100644
--- a/views/window.js
+++ b/views/window.js
@@ -14,18 +14,7 @@ button.onclick = function() {
       // should subdivide error handling.
       window.document.getElementById("translated-text").value = result;
     }
-
-    if (result.length > 60) {
-      window.document.getElementById("translated-text").style.fontSize = "16px";
-    } else if (result.length > 45) {
-      window.document.getElementById("translated-text").style.fontSize = "22px";
-    } else if (result.length > 30) {
-      window.document.getElementById("translated-text").style.fontSize = "27px";
-    } else if (result.length > 15) {
-      window.document.getElementById("translated-text").style.fontSize = "32px";
-    } else {
-      window.document.getElementById("translated-text").style.fontSize = "40px";
-    }
+    setTextFontSize(result, "translated-text");
   });
 };
 
@@ -40,20 +29,8 @@ const searchPress = function(e) {
 };
 const search = window.document.getElementById("text");
 search.onkeyup = function(event) {
-  const text = window.document.getElementById("text").value;
-
-  if (text.length > 60) {
-    window.document.getElementById("text").style.fontSize = "16px";
-  } else if (text.length > 45) {
-    window.document.getElementById("text").style.fontSize = "22px";
-  } else if (text.length > 30) {
-    window.document.getElementById("text").style.fontSize = "27px";
-  } else if (text.length > 15) {
-    window.document.getElementById("text").style.fontSize = "32px";
-  } else {
-    window.document.getElementById("text").style.fontSize = "40px";
-  }
-
+  const text = window.document.getElementById("text").value;s
+  setTextFontSize(text, "text");
   return searchPress(event);
 };
 
@@ -99,3 +76,18 @@ function setSourceText(text) {
   window.document.getElementById("translated-text").value = text;
   return text;
 }
+
+function setTextFontSize(text, elementId) {
+  if (text.length > 60) {
+    window.document.getElementById(elementId).style.fontSize = "16px";
+  } else if (text.length > 45) {
+    window.document.getElementById(elementId).style.fontSize = "22px";
+  } else if (text.length > 30) {
+    window.document.getElementById(elementId).style.fontSize = "27px";
+  } else if (text.length > 15) {
+    window.document.getElementById(elementId).style.fontSize = "32px";
+  } else {
+    window.document.getElementById(elementId).style.fontSize = "40px";
+  }
+  return text.length;
+}