body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    color: #333;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 20px auto;
    background: #fff;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

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

input[type="text"] {
    width: 70%;
    padding: 10px;
    margin-right: 10px;
    box-sizing: border-box;
}

button {
    padding: 10px 15px;
    background-color: #5cb85c;
    color: #fff;
    border: none;
    cursor: pointer;
    border-radius: 4px;
}

button:hover {
    background-color: #4cae4c;
}

main {
    text-align: center;
}

#list iframe {
    margin: 20px 0;
    border: none;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}