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HTML 

              
                <div id="container">
  <h1>Tip Calculator</h1>
  <div id="calculator">


    <form>
      <p>How much was your bill?
        <p>
          $ <input id="billamt" type="text" placeholder="Bill Amount">

          <p>How was your service?
            <p>
              <select id="serviceQual">
            <option disabled selected value="0">-- Choose an Option --</option>
            <option value="0.3">30&#37; &#45; Outstanding</option>
            <option value="0.2">20&#37; &#45; Good</option>
            <option value="0.15">15&#37; &#45; It was OK</option>
            <option value="0.1">10&#37; &#45; Bad</option>
            <option value="0.05">5&#37; &#45; Terrible</option>
        </select>

    </form>
    <p>How many people are sharing the bill?</p>
    <input id="peopleamt" type="text" placeholder="Number of People"> people
    <button type="button" id="calculate">Calculate!</button>

  </div>
  <!--calculator end-->
  <div id="totalTip">
    <sup>$</sup><span id="tip">0.00</span>
    <small id="each">each</small>
  </div>
  <!--totalTip end-->

</div>
<!--container end-->

<script type="text/javascript" src="tipcalculator.js"></script>
!

CSS 

              
                body {
  font-family: Roboto;
  background: #8E0E00;
  /* fallback for old browsers */
  background: -webkit-linear-gradient(to left, #8E0E00, #1F1C18);
  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to left, #8E0E00, #1F1C18);
  /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}

#container {
  height: 525px;
  width: 360px;
  margin: 100px auto;
  background: #f7f7f7;
  box-shadow: 0 0 3px rgba(0, 0, 0, 0.1);
  border-radius: 20px;
  -webkit-border-radius: 20px;
  -moz-border-radius: 20px;
}

h1 {
  background: #1F030C;
  color: white;
  margin: 0;
  padding: 10px 100px;
  text-transform: uppercase;
  font-size: 18px;
  font-weight: normal;
  border-top-left-radius: 20px;
  border-top-right-radius: 20px;
}

p {
  padding-left: 20px;
}

form input[type="text"] {
  width=90px;
}

input {
  padding-left: 20px;
}

#billamt {
  font-size: 14px;
  /*color: #2980b9;*/
  color: #red;
  background-color: #f7f7f7;
  width: 60%;
  padding: 5px 5px 8px 8px;
}

#billamt:focus {
  background: #fff;
  border: 3px solid #2980b9;
  outline: none;
}

#peopleamt {
  width: 60%;
  padding: 5px 5px 8px 8px;
  margin-left: 20px;
  color: #red;
  background-color: #f7f7f7;
  font-size: 14px;
}

.dollarSign {
  display: inline;
}

#serviceQual {
  padding: 13px 13px 20px 20px;
  margin-left: 20px;
  font-size: 25px;
}

button {
  text-transform: uppercase;
  font-weight: bold;
  display: block;
  margin: 30px auto;
  background: #AD133A;
  border-radius: 5px;
  width: 200px;
  height: 50px;
  font-size: 17px;
  color: white;
}

button:hover {
  background: #4c2827;
  border-bottom-color: #111;
}

button:active {
  position: relative;
  top: 1px;
}

#totalTip {
  font-size: 30px;
  margin-top: 5px;
  text-align: center;
}

#totalTip:before {
  content: "Tip amount";
  font-size: 20px;
  font-weight: bold;
  display: block;
  text-transform: uppercase;
}

#totalTip sup {
  font-size: 20px;
  top: -18px;
}

#totalTip small {
  font-size: 20px;
  font-weight: bold;
  display: block;
}
!

JS 

              
                //Calculate Tip
function calculateTip() {
  var billAmt = document.getElementById("billamt").value;
  var serviceQual = document.getElementById("serviceQual").value;
  var numOfPeople = document.getElementById("peopleamt").value;

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

  //Calculate tip
  var total = (billAmt * serviceQual) / numOfPeople;
  //round to two decimal places
  total = Math.round(total * 100) / 100;
  //next line allows us to always have two digits after decimal point
  total = total.toFixed(2);
  //Display the tip
  document.getElementById("totalTip").style.display = "block";
  document.getElementById("tip").innerHTML = total;

}

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

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

};
!
999px

Console