JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div id="wrapper">
        <center>
            <div id="wrapperRatio4Zu3">
                <canvas id="game" class="gameCanvas"></canvas>
            </div>
        </center>
    </div>
</body>

CSS

html, body{
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: #000;
}

#wrapper{
  position: fixed;
  top: 30px;
  left: 30px;
  right: 30px;
  bottom: 30px;
  background-color: purple;
  vertical-align: middle;
  text-align: center;
}

#wrapperRatio4Zu3{
  display: inline-block;
  width: 100%;
  padding-bottom: 25%;
  background:gold;
}

.gameCanvas{
  margin: 0 auto;
  height: 100%;
  width: 100%;
}