diff --git a/intro.html b/intro.html
index 33857f9..e95d460 100755
--- a/intro.html
+++ b/intro.html
@@ -2,7 +2,7 @@
 <html lang="ja">
   <head>
     <meta charset="utf-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
     <title>IntroQuiz2018</title>
     <script type="text/javascript" src="intro.js" charset="utf-8"></script>
     <style type="text/css">
@@ -11,58 +11,79 @@
 	  p#info {padding: 1ex; margin: 0; border: 3px ; background: white;
 	  font-size: 100%;}
 	  p#warn {color: red;}
-	  button#push {font-size: 1000%; width: 60vw;}
+	  
+	  button#push {font-size:5em; width: 90%; height: 5em; margin: 0 auto;}
 	  button.win {background: linear-gradient(#f8eb22, #878013);}
 	  .c {text-align: center;}
 	-->
     </style>
+    <script>
+      /* ピッチインピッチアウトによる拡大縮小を禁止 */
+      document.documentElement.addEventListener('touchstart', function (e) {
+      if (e.touches.length >= 2) {e.preventDefault();}
+      }, false);
+      /* ダブルタップによる拡大を禁止 */
+      var t = 0;
+      document.documentElement.addEventListener('touchend', function (e) {
+      var now = new Date().getTime();
+      if ((now - t) < 350){e.preventDefault();}
+		      t = now;
+		      }, false);
+		      //
+		      </script>
+    <style>
+      body, input, textarea, select, button {
+      /* 入力欄にフォーカスが当たっても拡大しない */
+      font-size:17px;
+      }
+    </style>
     <script type="text/javascript">
-function intro() {
-    var team = document.getElementById("tm"),
-    	button = document.getElementById("push"),
-    	warn = document.getElementById("warn"),
-    	info = document.getElementById("info");
-    var conn, PORT=4946, server = 0.0.0.0;
-    function initConn() {
-	try {
-	    conn = new WebSocket('ws://' + server + ':' + PORT + '/');
-	    conn.onopen = function() {};		// Nothing special
-	    conn.onerror = function(err) {
-		info.textContent = 'WebSocket failure: ' + err
-	    };
-	    warn.textContent = null;
-	    conn.onmessage = function(ev) {
-		if (ev.data) {
-		    var j = JSON.parse(ev.data);
-		    info.textContent = j.info;
-		    warn.textContent = j.warn;
-		    if (j.rank == 1)
-			button.setAttribute("class", "win");
-		    else
-			button.setAttribute("class", null);
-		}
-	    };
-	    conn.onclose = function(ev) {
-		info.textContent = "接続断: PUSHで参加";
-		conn = null;
-	    };
-	    info.textContent = "Ready...";
-	} catch (err) {
-	    alert("Socket Creation Error\n\
-Firefoxですか? URLウィンドウに about:config と入れて\n\
-Search: 窓に websocket と入れて、\n\
-network..websocket.allowInsecureFromHTTP\n\
-の行をダブルクリックして true に変えてください。\n" + err);
-	}
-    }
-    function push(ev) {
-	if (!conn) initConn();
-	conn.send(team.value);
-    }
-    button.addEventListener("mousedown", push, false);
-    initConn();
-}
-document.addEventListener("DOMContentLoaded", intro, false);
+      function intro() {
+      var team = document.getElementById("tm"),
+      button = document.getElementById("push"),
+      warn = document.getElementById("warn"),
+      info = document.getElementById("info");
+      var conn, PORT=4946, server = 0.0.0.0;
+      function initConn() {
+      try {
+      conn = new WebSocket('ws://' + server + ':' + PORT + '/');
+      conn.onopen = function() {};		// Nothing special
+      conn.onerror = function(err) {
+      info.textContent = 'WebSocket failure: ' + err
+      };
+      warn.textContent = null;
+      conn.onmessage = function(ev) {
+      if (ev.data) {
+      var j = JSON.parse(ev.data);
+      info.textContent = j.info;
+      warn.textContent = j.warn;
+      if (j.rank == 1)
+      button.setAttribute("class", "win");
+      else
+      button.setAttribute("class", null);
+      }
+      };
+      conn.onclose = function(ev) {
+      info.textContent = "接続断: PUSHで参加";
+      conn = null;
+      };
+      info.textContent = "Ready...";
+      } catch (err) {
+      alert("Socket Creation Error\n\
+      Firefoxですか? URLウィンドウに about:config と入れて\n\
+      Search: 窓に websocket と入れて、\n\
+      network..websocket.allowInsecureFromHTTP\n\
+      の行をダブルクリックして true に変えてください。\n" + err);
+      }
+      }
+      function push(ev) {
+      if (!conn) initConn();
+      conn.send(team.value);
+      }
+      button.addEventListener("mousedown", push, false);
+      initConn();
+      }
+      document.addEventListener("DOMContentLoaded", intro, false);
 
     </script>
   </head>
