body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
}

.container {
    width: 600px;
    margin: 0 auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
}

label {
    margin-top: 10px;
    display: block;
}

input, select {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    margin-top: 20px;
    padding: 10px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    width: 100%;
}

button:hover {
    background-color: #218838;
}

.result {
    margin-top: 20px;
    padding: 10px;
    background-color: #e2e3e5;
    border-left: 6px solid #28a745;
}