body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f2f5;
}

.container {
    width: 80%;
    max-width: 600px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    padding: 20px;
    text-align: center;
}

#chat-container {
    height: 300px;
    overflow-y: auto;
    margin-bottom: 20px;
    border: 1px solid #ccc;
    padding: 10px;
}

.chat-log {
    text-align: left;
}

#user-input {
    width: 70%;
    padding: 10px;
    margin-right: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    padding: 10px 15px;
    background-color: #4CAF50;
    border: none;
    color: white;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    cursor: pointer;
    border-radius: 4px;
}

button:hover {
    background-color: #45a049;
}