--- a/index.html	Sat Nov 28 06:12:04 2020 +0900
+++ b/index.html	Sat Nov 28 06:32:10 2020 +0900
@@ -54,6 +54,11 @@
             opacity: 0;
         }
 
+        .outputbox > img {
+            max-width: 100%;
+            max-height: 100vh;
+        }
+
         .title {
             font-size: 16px;
         }
@@ -85,7 +90,7 @@
     <script>
         var inputDom = document.querySelector(".js-qr-input")
         var outputDom = document.querySelector(".js-qr-output")
-        var qr = new QRCode(outputDom, { correctLevel: QRCode.CorrectLevel.L })
+        var qr = new QRCode(outputDom, { correctLevel: QRCode.CorrectLevel.L, width: 1024, height: 1024 })
 
         var runTimeout = null
         var debouncedRefreshCode = function() {