button에 type="button" 지정

index.php

@@ -134,7 +134,7 @@ function postOAuthResult(result){
 <body>
 <nav class="navbar navbar-expand-lg fixed-top navbar-light bg-light">
   <a class="navbar-brand" href=".">삼국지 모의전투 HiDCHe</a>
-  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
+  <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
     <span class="navbar-toggler-icon"></span>
   </button>
   <div class="collapse navbar-collapse" id="navbarNav">