JSFiddle - React, Tailwind, and code Playground

HTML

<script>
	function calBodyMass() {
    var addHeight = document.getElementById("mass").value;
    var addMass = document.getElementById("height").value;
    var calculateBodyMass = addMass /(addHeight * addHeight);
    console.log(calculateBodyMass);
    document.getElementById("showResult").innerHTML = calculateBodyMass; 
}
</script>


<div>
  <div class="add-mass">
    <label class="inputLable">Add Wieght</label>
    <br />
    <input type="text" value="" id="mass" />
  </div>
  <br /><br />
  <div class="add-height">
    <label class="inputLable">Add Height</label>
    <br />
    <input type="text" value="" id="height" />
  </div>
  <br /><br />
  <button onclick="calBodyMass()">calculate</button>
  <br /><br />
  <span id="showResult"></span>
</div>