body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

audio {
    display: none;
}

.chat-container {
    width: 400px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.chat-header {
    background-color: #4a4a4a;
    color: white;
    padding: 15px;
    text-align: center;
}

.chat-messages {
    height: 400px;
    overflow-y: auto;
    padding: 15px;
}

.chat-message {
    margin-bottom: 10px;
    padding: 10px;
    border-radius: 5px;
    max-width: 80%;
}

.chat-message.sent {
    background-color: #007bff;
    color: white;
    align-self: flex-end;
    margin-left: auto;
}

.chat-message.received {
    background-color: #e9ecef;
    color: black;
}

.chat-input-area {
    display: flex;
    flex-direction: column;
    padding: 15px;
    background-color: #f8f9fa;
}

#usernameInput, #messageInput {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

#sendButton {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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