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HTML 

              
                12<!-- write up at: https://lynnamacher.com/tip-calculator-programs/ -->
<!--10/09/19 done, final updates-->
<!DOCTYPE html>
<html lang="en">

<head>
  <link href="tip.css" rel="stylesheet">
  <link href="https://fonts.googleapis.com/css?family=Ubuntu+Condensed&display=swap" rel="stylesheet">
</head>
<body>
  <div id="container">
    <h1>Bill Splitter and Tip Calculator</h1>

    <form>
      <p>Amount of Bill: </p>
      <p>$ <input type="text" class="fillBox" id="amtbill" placeholder="Amount Of Bill"> </p>


        <p>How was the service? </p>
      <p><select id="servicelevel">
        <option disabled selected value="0">Select an option</option>
        <option value="0.12">Great 12%</option>
        <option value="0.1">Good 10%</option>
        <option value="0.07">OK 7%</option>
        <option value="0.05">Poor 5%</option>
        <option value="0.01">Horrible 1%</option></select>
       </p>

       <p>How many people are splitting the bill?</p>
       <p><input type="text" class="fillBox" id="numpeople" placeholder="Number of People"> </p>


<button type="button" id="calculate"> Calculate Totals</button>
    </form>
    <div id="totalArea">
<div id="billSplit">
  <sup>$</sup><span id="split">0.00</span>
  <small id="each">per person</small>
</div>

    <div id="totalTip">
      <sup>$</sup><span id="tip">0.00</span>
      <small id="each2">per person</small>
    </div>

    <div id="grandTotal">
      <sup>$</sup><span id="grand">0.00</span>
      <small id="each3">per person</small>
    </div>
  </div>
    <script type="text/javascript" src="tipcalc.js"></script>
  </div>
  </body>
</html>
!

CSS 

              
                html {
  background-color: #013982;
  font-family: 'Ubuntu Condensed', sans-serif;
}
p{
  font-size: 1.2em;
}
#container {
  background-color: #fff;
  width: 600px;
  height: 625px;
  border-radius: 25px;
  margin: 25px auto;
}

H1 {
  text-align: center;
  color: white;
  background-color: #000;
  padding: 5px;
  border-radius: 25px 25px 0px 0px;
}

form {
  padding-left: 10px;
  font-size: 1.2em;
}

.fillBox {
  width: 95%;
  height: 23px;
  padding: 2 px 7px;
  font-size: 1.1em;
}

.totalArea {
  width: 585px;
  height: 20px;
  font-size: 1.2em;
}

#servicelevel {
    width: 98%;
    height: 40px;
    padding-left: 6px;
    padding-bottom: 4px;
    font-size: 1.1em;
}

button {
  font-size: 25px;
  display: block;
  margin: 30px auto;
  border-radius: 25px;
  color: white;
  background-color: #7299cc;
}

#totalArea {
width: 590px;
margin-left: 5px;
align-items: stretch;
}
sup {
  font-size: 1.5em;
  top: -13px;
}

small {
  font-size: 1.2em;
  font-weight: bold;
  display: block;
}

#tip {
  font-size: 2.5em;
}

#totalTip {
  font-size: 1.2em;
  margin-top: 5px;
  text-align: center;
  float: left;
  width: 190px;
}

#totalTip:before {
  content: "Tip Amount:";
  font-size: 1.2em;
  font-weight: bold;
  display: block;
  text-transform: uppercase;
}

#split {
  font-size: 2.5em;
}


#billSplit {
  font-size: 1.2em;
  margin-top: 5px;
  text-align: center;
  float: left;
  width: 190px;
  border-right: 2px solid #555;
}

#billSplit:before {
  content: "Bill:";
  font-size: 1.2em;
  font-weight: bold;
  display: block;
  text-transform: uppercase;
}

#grand {
  font-size: 2.5em;
}

#grandTotal {
  font-size: 1.2em;
  margin-top: 5px;
  text-align: center;
  margin-left: 0px;
  float: left;
  width: 190px;
    border-left: 2px solid #555;
}

#grandTotal:before {
  content: "Grand Total:";
  font-size: 1.2em;
  font-weight: bold;
  display: block;
  text-transform: uppercase;
}
!

JS 

              
                //Hide the tip amount on load
document.getElementById("totalTip").style.display = "none";
document.getElementById("billSplit").style.display = "none";
document.getElementById("grandTotal").style.display = "none";
//document.getElementById("each").style.display = "none";

//click to call function
document.getElementById("calculate").onclick = function() {
  calculateTip();
};

//PUll in variables from form
function calculateTip() {
  var billAmt = document.getElementById("amtbill").value;
  var serviceLevel = document.getElementById("servicelevel").value;
  var numPeople = document.getElementById("numpeople").value;

  //Checks to make sure they are numbers only
  if(isNaN(document.getElementById("amtbill").value) || isNaN(document.getElementById("numpeople").value)){
    alert("Please enter numbers only");
    location.reload();
   }else{ }


  //validate inputs
  if (billAmt === "" || serviceLevel == 0) {
    alert("Please enter values");
    return;
  }
  //Check to see if this input is empty or less than or equal to 1
  if (numPeople === "" || numPeople <= 1) {
    numPeople = 1;
    document.getElementById("each").style.display = "none";
    document.getElementById("each2").style.display = "none";
    document.getElementById("each3").style.display = "none";
    document.getElementById("billSplit").style.display = "none";
  } else {
    document.getElementById("each").style.display = "block";
    document.getElementById("each2").style.display = "block";
    document.getElementById("each3").style.display = "block";
  }

  //Calculate bill splitting
  var billTotal = billAmt / numPeople;

  //Calculate tip amount
  var total = (billAmt * serviceLevel) / numPeople;

  //calculate total
  var grandTotal = billTotal + total;

  //round to two decimal places
  total = Math.round(total * 100) / 100;
  billTotal = Math.round(billTotal * 100) / 100;
  grandTotal = Math.round(grandTotal * 100) / 100;

  //next line allows us to always have two digits after decimal point
  total = total.toFixed(2);
  billTotal = billTotal.toFixed(2);
  grandTotal = grandTotal.toFixed(2);

//Display the split total
//if there is only 1 hide this area
if (numPeople === "" || numPeople <= 1) {
  numPeople = 1;
  document.getElementById("billSplit").style.display = "hidden";
  document.getElementById("split").innerHTML = billTotal;
} else {
    document.getElementById("billSplit").style.display = "block";
    document.getElementById("split").innerHTML = billTotal;
}
//Display the tip
    document.getElementById("totalTip").style.display = "block";
    document.getElementById("tip").innerHTML = total;

//Display the Grand Totals
    document.getElementById("grandTotal").style.display = "block";
    document.getElementById("grand").innerHTML = grandTotal;
}
!
999px

Console