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<div class="restart">
  <input class="reload" type="button" value="スタート" onclick="window.location.reload(true);">
</div>

<!-- <div class="start">
  <input class="　start" type="button" value="開始" onclick="start()">
</div> -->

<div class="container">
  <div class="box">
    <div id="clock">10</div>
    <h1 class="msg">Your Are Over Load</h1>
  </div>
</div>

<svg version="1.1" xmlns="http://www.w3.org/2000/svg"><path id="wave" d=""/></svg>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/2.0.1/TweenMax.min.js"></script>
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/85188/jquery.wavify.js"></script>

$(function() {
  var sec = 10;
  var op = 0;
  setInterval(function() {
    sec -= 1;
    op += 1;
    if (sec < 0) {
      sec = 0;
      return false;
    }
    // 0埋め
    sec_number = ("0" + sec).slice(-2);
    $("#clock").html(sec_number);

    $("h1").css("opacity", 0 + op / 10);

    $("#wave").wavify({
      height: 0 + sec * 60,
      bones: 8,
      amplitude: 80,
      color: "crimson",
      speed: 0.3
    });
  }, 1000);
});

$(function() {
  $(".reload").click(function() {
    location.reload();
  });
});

@import url("https://fonts.googleapis.com/css?family=Merienda");

.reload{
  color: white;
  background-color: crimson;
  border-width: 4px;
  border-color: white;
  font-size: 38px;
  font-weight: 900;
  display: block;
  z-index: 1000;
  width: auto;
  position: absolute;
  top: 0;
  left: 0;
  cursor: pointer;
  padding: 20px;
}

// .start{
//   left: 120px;
// }
#clock {
  font-size: 120px;
  padding: 10px;
  color: darkorange;
  margin-bottom: -40px;
  z-index: 100;
  text-shadow: 2px 2px 0px #fff;
  /*   top: 0; */
}

svg {
  height: 100vh;
  width: 100vw;
  position: absolute;
  top: 0;
  left: 0;
}

body {
  font-family: "Merienda", cursive;
  background: #000;
}
h1 {
  color: rgba(0, 0, 0, 0.8);
  /*   color: crimson; */
  opacity: 0;
  font-size: 48px;
}
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}
.box {
  background: rgba(255, 255, 255, 0.4);
  border-radius: 5px;
  padding: 15px 40px;
  text-align: center;
  position: absolute;
  z-index: 1;
}
a {
  color: #0bd;
}