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HTML 

              
                <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width-device-width, initial-scale=1.0">
        <title>Tip Calculator</title>
        <link rel="stylesheet" type="text/css" href="styles.css">
    </head>
    <body>
        <div class="main-container">
           <h1>TIP CALCULATOR</h1>

            <div id="calculator">
                <form>
                    <p>How much was your bill?</p>

                        <label for="bill-amount">$</label>
                        <input type="text" id="bill-amount" name="bill-amount" placeholder="Bill amount" required>
                    <p>How was your service?</p>

                    <label for="service"></label>
                    
                    <select name="service-quality" id="service-quality">
                        <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 splitting the bill?</p>

                <form class="people">
                    <input type="text" id="num-people" name="num-people" placeholder="Number of People" required>
                    <label for="num-people">people</label>
                </form>

                
                <button type="submit" id="calculate-button">CALCULATE!</button>
                
                
            </div>
            <!--Calcualtor end-->
            <div id="totalTip">
                <sup>$</sup><span id="tip">0.00</span>
                <small id="each">each</small>
            </div>
            <!--totalTip ends-->
        
        </div>
        <!--container ends-->

        <script src="app.js" meta="utf-8"></script>
    </body>
    </html>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');
body {
    background: #BC8F8F;
    font-family: Roboto, sans-serif;
    font-weight: bold;
}

.main-container {
    height: 525px;
    width: 360px;
    margin: 100px auto;
    border: 1px solid black;
    border-radius: 20px;
    background: cornsilk;

    
}

h1 {
    background: darkred;
    text-align: center;
    color: white;
    margin: 0;
    font-size: 18px;
    padding: 10px 10px;
    font-weight: normal;
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    
}

p {
    padding-left: 22px;
}

label {
    padding-left: 22px;
}

#bill-amount {
    height: 20px;
    font-size: 15px;
    background-color: #f7f7f7;
    width: 60%;
    padding: 5px 5px 8px 8px;
}

#service-quality {
    height: 35px;
    font-size: 15px;
    background-color: #f7f7f7;
    width: 60%;
    padding: 5px 5px 8px 8px;
}

label[for="service"] {
    padding-left: 35px;
}

.people {
    padding-left: 35px;
}

#num-people {
    background-color: #f7f7f7;
    height: 20px;
    font-size: 15px;
    width: 60%;
    padding: 5px 5px 8px 8px;
    
}

button {
    font-weight: bold;
    display: block;
    margin: 30px auto;
    background: #AD133A;
    border-radius: 5px;
    width: 200px;
    height: 50px;
    font-size: 18px;
    color: white;
}

button:hover {
    background: red;
}

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

#totalTip {
    font-size: 35px;
    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 

              
                // First of all, create a fucntion to calculate the tip

function tipCalculator () {
    let billAmount_div = document.getElementById("bill-amount").value;
    let serviceQuality_label = document.getElementById("service-quality").value;
    let peopleNum_form = document.getElementById("num-people").value;

    //Make sure input is valid
    if (billAmount_div === " " || serviceQuality_label === 0) {
        alert("Please enter valid values");
        return;
    }

    //Check to see if number of people are valid
    if (peopleNum_form === " " || peopleNum_form <= 1) {
        peopleNum_form = 1;
        // This hides the word  "each" if number of people bar is empty or equals 1
        document.getElementById("each").style.display = "none";
    }
    else {
        // This shows it in block form
        document.getElementById("each").style.display = "block";
    }

    //Now to calculate the tip
    let total = (billAmount_div * serviceQuality_label) / peopleNum_form;
    //round to two decimal places
    total = Math.round(total * 100)/100;
    //Allows two digits after decimal point
    total = total.toFixed(2);

    //Now display the tip on browser
    document.getElementById("totalTip").style.display = "block";
    document.getElementById("tip").innerHTML = total;
};

//hide the tip amount when it is loading
document.getElementById("totalTip").style.display = "none";
document.getElementById("each").style.display = "none";

//Now set calculate-button to call function on click
document.getElementById("calculate-button").onclick = function () {
    tipCalculator();
};
!
999px

Console