body {

    font-family: Arial, sans-serif;

    background: #f2f2f2;

    margin: 0;
}

.container {

    width: 500px;

    margin: 50px auto;

    background: white;

    padding: 30px;

    border-radius: 10px;

    box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

h1 {

    text-align: center;
}

label {

    display: block;

    margin-top: 15px;
}

input,
select {

    width: 100%;

    padding: 10px;

    margin-top: 5px;
}

button {

    width: 100%;

    margin-top: 20px;

    padding: 12px;

    cursor: pointer;
}

.result {

    margin-top: 20px;

    font-size: 20px;

    text-align: center;

    font-weight: bold;
}