body {
    font-family: 'Arial', sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
}

.container {
    width: 400px;
    margin: 50px auto;
    background-color: #ffffff;
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1, h2 {
    text-align: center;
    color: #333;
}

.form-group {
    margin-bottom: 15px;
}

.form-control {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    display: block;
    width: 100%;
    padding: 10px;
    background-color: #3498db;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    margin-top: 10px;
    cursor: pointer;
}

button:hover {
    background-color: #2980b9;
}

.result {
    margin-top: 20px;
    padding: 15px;
    background-color: #ecf0f1;
    border-radius: 4px;
    text-align: center;
}