body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

.container {
    width: 90%;
    max-width: 500px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
}

h1 {
    color: #333;
}

.selector {
    margin: 15px 0;
}

select, button {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border-radius: 5px;
}

button {
    background: #ff5722;
    color: white;
    border: none;
    cursor: pointer;
    font-size: 18px;
    border-radius: 5px;
}

button:hover {
    background: #e64a19;
}

#result {
    margin-top: 20px;
    font-size: 18px;
    font-weight: bold;
}