style.css

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f4f6f8;
}

.container {
    width: 360px;
    margin: 60px auto;
    background: #ffffff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0px 0px 12px rgba(0,0,0,0.15);
}

h2 {
    text-align: center;
    margin-bottom: 20px;
}

label {
    font-size: 14px;
    font-weight: bold;
}

input {
    width: 100%;
    padding: 7px;
    margin-top: 4px;
    margin-bottom: 12px;
}

button {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
}

button:hover {
    background-color: #0056b3;
}

#result {
    margin-top: 15px;
    font-size: 18px;
    color: green;
    text-align: center;
    font-weight: bold;
}