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HTML

              
                <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Interest Calculator</title>
    <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;500&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="style.css">
</head>
<body>
    
    <div class="container">
        <div class="input-wrapper">
            <div class="wrapper">
                <label for="principal">Principal($):</label>
                <input type="number" id="principal" value="1000" />
            </div>
            <div class="wrapper">
               <label for="rate">Rate(%):</label>
               <input type="number" id="rate" value="5" /> 
            </div>
        </div>
        <label for="time">Time:</label>
        <div class="time-wrapper">
            <input type="number" id="time" value="1" />
            <select name="duration" id="duration">
                <option value="year">Year</option>
                <option value="month">Month</option>
            </select>
        </div>
        <button id="calculate-btn">Calculate </button>
        <div id="result"></div>
    </div>
    <script src="script.js"></script>
  <div class="footer"><p>Created by <a href="https://www.rembertdesigns.co/" target="_blank">Richard Rembert</a></p>
    </div>
</body>
</html>
              
            
!

CSS

              
                *{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
}
body{
    height: 100vh;
    background: linear-gradient(#8f01e2, #a872ff);
}
.container{
    background-color: #ffffff;
    position: absolute;
    transform: translate(-50%, -50%);
    top: 50%;
    left: 50%;
    width: 80vw;
    max-width: 600px;
    min-width: 350px;
    padding: 60px 30px;
    border-radius: 10px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}
label{
    display: block;
    font-size: 22px;
    margin-bottom: 10px;
    font-weight: 500;
}
input{
    margin-bottom: 20px;
    border: none;
    font-size: 20px;
    border-bottom: 2px solid #585858;
    color: #585858;
    padding: 2px 15px;
}
input:focus{
    outline: none;
    border-bottom: 2.4px solid #8f01e2;
}
.input-wrapper{
    display: flex;
    justify-content: space-between;
    gap: 20px;
}
.input-wrapper input{
    width: 100%;
}
.time-wrapper input{
    width: 60%;
}
select{
    width: 35%;
    border: 1px solid #585858;
    font-size: 20px;
    margin-left: 3%;
    padding: 8px 0;
    border-radius: 5px;
}
button{
    display: block;
    background-color: #e28801;
    border: none;
    color: #ffffff;
    margin: 20px auto 0 auto;
    padding: 15px 40px;
    font-size: 20px;
    border-radius: 5px;
}
#result{
    background-color: #ffc772;
    margin-top: 30px;
    color: #585858;
    text-align: center;
    font-size: 18px;
    padding: 20px;
    border-radius: 5px;
}
#result div{
    margin-bottom: 10px;
}
#result span{
    color: #000000;
    font-weight: 500;
}
.footer {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    padding: 1rem;
    background-color: #fff;
    text-align: center;
  }
.footer p {
  text-decoration: none;
  color: #000;
}
.footer a {
    text-decoration: none;
    color: #e28801;
}
.footer a:hover {
    text-decoration: underline;
    color: red;
}
              
            
!

JS

              
                let calculateBtn = document.getElementById("calculate-btn");
let result = document.getElementById("result");
let calculate = () => {
    let p = Number(document.getElementById("principal").value);
    let r = Number(document.getElementById("rate").value);
    let t = Number(document.getElementById("time").value);
    let duration = document.getElementById("duration").value;
    let simpleInterest = 
    duration == "year" ? (p*r*t) / 100 : (p*r*t) / 1200;
    let amount = p + simpleInterest;

    result.innerHTML = `<div>Principal Amount: <span>$${p.toFixed(
        2
        )}</span></div>
        <div>Total Interest: <span>$${simpleInterest.toFixed(2)}</span></div>
        <div>Total Amount: <span>$${amount.toFixed(2)}</
        span></div>`;
};
calculateBtn.addEventListener("click", calculate);
window.addEventListener("load", calculate);
              
            
!
999px

Console