<div>
        Test (14 * 1.2 = 16.8px)
        <div>
            Test (16.8 * 1.2 = 20.16px)
            <div>
                Test (20.16 * 1.2 = 24.192px)
            </div>
        </div>
    </div>

body {
  font-size: 14px;
  text-align: center;
  background: #ff5722;
}
div {
  font-size: 1.2em;
  color: #64ffda;
  font-weight: bold;
  padding: 2em;
}