CodePen Embed - Finding HTML Elements

<div id="box" class="box"></div>

html, body {
  height: 100%;
}

body {
  display: grid;
  justify-content: center;
  align-content: center;
  
  
}

.box{
  display: grid;
  justify-content: center;
  align-content: center;
  
  width: 250px;
  height: 100px;
  margin: 10px;
  
  border: 3px solid #333;
  font-family: sans-serif;
  font-weight: bold;
}

const box = document.getElementById('box')

box.textContent = "I am a box."

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