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

.chat-container {
    max-width: 400px;
    margin: 0 auto;
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.chat-header {
    background-color: #3498db;
    color: #fff;
    padding: 10px;
    text-align: center;
}

.chat-header h1 {
    margin: 0;
}

.chat-box {
    max-height: 400px;
    overflow-y: auto;
    padding: 10px;
}

.user-input {
    display: flex;
    background-color: #f7f7f7;
    padding: 10px;
}

#user-input {
    flex-grow: 1;
    padding: 5px;
    border: none;
    border-radius: 5px;
}

#send-button {
    background-color: #3498db;
    color: #fff;
    border: none;
    border-radius: 5px;
    padding: 5px 10px;
    cursor: pointer;
    margin-left: 10px;
}

#send-button:hover {
    background-color: #1c6ea4;
}