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HTML

            
              <html>
<head>
<link href='https://fonts.googleapis.com/css?family=VT323' rel='stylesheet'>
</head>
<body>
<H1>BMI CALCULATOR</H1>
<div id="scale_main">
  <div id="scale_display">
        <h2 id="range" class="neutral">Enter Measurements</h2>
        <h3 id="bmi" >--.--</h3>
        <div id="needle">
        </div>
        <div id="needle_bottom">
        </div>
      </div>
  
    <div class="measurement" id="height">
        <h4>Height</h4>
        
        <input class="input" type="text" id="height_input" name="height"            required></input>
      <span class="unit">Inches</span>
   </div>
   <div class="measurement" id="weight">
        <h4>Weight</h4>
        <input class="input" type="text" id="weight_input" name="weight" required></input>
        <span class="unit">Pounds</span>
   </div>
 
      <div>
        <button id="calculate" onclick="calculate(document.getElementById('height_input').value, document.getElementById('weight_input').value)">CALCULATE</button>
        <button id="clear" onclick="clear_calculator()">CLEAR</button>
  </div>
  
 </div>
  </body>
</html>
!

CSS

            
              body{
  background-color: #B1FAFF;
}

h1{
  text-align: center;
  font-family: sans-serif;
  color: #0182D8;
  font-size: 36px;
  margin-top: 80px;
}

h2{
  text-align: center;
  margin-bottom: 5px;
  font-family: sans-serif;
  font-size: 20px;
}

h3{
  text-align: center;
  margin-top: 0px;
  font-family: "VT323";
  font-size: 32px;
  color: #FFFFFF;
  margin-bottom: 5px;
}

h4{
  font-family: sans-serif;
  margin-bottom: 5px;
  margin-top: 85px;
  font-size: 20px;
  color: #0182D8;
}

#scale_main{
  background-color: #FFFFFF;
  width: 600px;
  min-height: 650px;
  margin: 0 auto;
  margin-top: 20px;
  border-radius: 20px;
  box-shadow: -1px 3px 15px #888888;
}

#scale_display{
  background-color: #DEE0E5;
  width: 60%;
  height: 140px;
  margin-left: 20%;
  margin-top: 50px;
  border-radius: 100px 100px 0 0;
  float: left;
  box-shadow: 0px -1px 2px #888888;
}

#needle{
  background-color: #E22A2A;
  width: 3px;
  height: 47px;
  margin-left: 50%;
  box-shadow: 0px 3px 15px #888888;
}

#needle_bottom{
  background-color: #E22A2A;
  width: 20px;
  height: 12px;
  margin-left: 47.5%;
  border-radius: 100px 100px 0px 0px;
  box-shadow: 0px -1px 7px #888888;
}

.measurement{
  width: 40%;
  float: left;
  margin-left: 10%;
  
}

.input{
  width: 45%;
  font-size: 24px;
  vertical-align: bottom;
  border-color: #DEE0E5;
  border-style: solid;
  font-family: sans-serif;
}

.unit{
  font-family: sans-serif;
  font-weight: 700;
  font-size: 20px;
}

#calculate{
  margin-left: 35%;
  margin-top: 100px;
  padding: 4px 40px;
  border-radius: 7px;
  font-size: 20px;
  box-shadow: 0px 0px;
  border-style: none;
  color: #FFFFFF;
  background-color: #16BE5F;
}

#calculate:hover{
  cursor: pointer;
}

#clear{
  margin-left: 35%;
  margin-top: 15px;
  padding: 4px 65px;
  border-radius: 7px;
  font-size: 20px;
  box-shadow: 0px 0px;
  border-style: none;
  color: #FFFFFF;
  background-color: #E22A2A;
}

#clear:hover{
  cursor: pointer;
}


.neutral{
  color: #000000;
}

.good{
  color: #16BE5F;
}

.bad{
  color: #E22A2A;
}
!

JS

            
              

function calculate(height, weight) {
  weight = parseInt(weight);
  height = parseInt(height);
  console.log("Height", height);
  console.log("Weight", weight);
  weight = weight * 703;
  height = height*height;
  var bmi = weight/height;
  console.log("BMI: ", bmi);
  document.getElementById('bmi').innerHTML = bmi.toPrecision(3);
  
  if(bmi < 18.5)
    {
      document.getElementById('range').innerHTML = "Underweight";
      document.getElementById('range').classList.remove("neutral");
      document.getElementById('range').classList.remove("good");                 document.getElementById('range').classList.add("bad");
    }
  
   if(bmi >= 18.5 && bmi < 25)
    {
      document.getElementById('range').innerHTML = "Normal";
      document.getElementById('range').classList.remove("neutral");
      document.getElementById('range').classList.remove("bad");                   document.getElementById('range').classList.add("good");
    }
  
   if(bmi >= 25 && bmi < 30)
    {
      document.getElementById('range').innerHTML = "Overweight";
      document.getElementById('range').classList.remove("neutral");
      document.getElementById('range').classList.remove("good");                 document.getElementById('range').classList.add("bad");
    }
  
   if(bmi > 30)
    {
      document.getElementById('range').innerHTML = "Obese";
      document.getElementById('range').classList.remove("neutral");
      document.getElementById('range').classList.remove("good");                 document.getElementById('range').classList.add("bad");
    }
};

function clear_calculator(){
  console.log("Clear");
  document.getElementById('range').classList.remove("bad");
  document.getElementById('range').classList.remove("good");
  document.getElementById('range').classList.add("neutral");
  document.getElementById('range').innerHTML = "Enter Measurements";
  document.getElementById('bmi').innerHTML = "--.--";
  document.getElementById('height_input').value="";
  document.getElementById('weight_input').value="";
  document.getElementById('height_input').focus();
};
!
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