<div class="stage">
  <div class="stage-floor"> </div>   
</div>
body { background: #005f15; }
* { box-sizing: border-box; }

.stage { position: relative; margin: 0 auto; width: 400px; height: 500px; background: #fff; overflow:hidden; }
.stage-floor { position: absolute; bottom: 0; left: 0; width: 2000px; height: 450px;
	background: url(https://wanchen-travel.com/wp-content/uploads/2020/10/stage-floor-bg-1.png) top center no-repeat; z-index: 3 }

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