<p>Вибери потрібне значення для <code>perspective-origin</code>(у відсотках):</p>

<input type="number" value="50" step="10" max="100" min="0" id="field"></input>
<input type="number" value="50" step="10" max="100" min="0" id="field2"></input>

<div id="container">
	<div class="rotate">
    Привіт! :)
  </div>
</div>
body {
	padding: 36px;
  text-align: center;
  line-height: 1.45;
  font-size: 17px;
  font-family: sans-serif;
}

#field,
#field2{
  padding: 8px;
}

#container {
  padding: 16px;
  perspective: 100px;
}

.rotate {
  width: 100px;
  padding: 30px;
  text-align: center;
  background: gold;
  transform: rotateX(15deg);
  margin: 36px auto 0 auto;
  perspective: 100px;
}
var container = document.getElementById('container');
var field = document.getElementById('field');
var field2 = document.getElementById('field2')

field.onchange = field2.onchange = function change() {
  var newVal = getNewValue();  
  container.style.perspectiveOrigin = newVal[0] + '% ' + newVal[1] + '%'; 
}

function getNewValue() {
  var result = [];
  result[0] = field.value;
  result[1] = field2.value;  
  return result;
}

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