body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.chat-container {
    background: white;
    width: 900px; /* width of chatbox  */
    height: 80vh; /* height of chatbox */
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
h2 {
    background: #4CAF50;
    color: white;
    margin: 0;
    padding: 10px;
    text-align: center;
}
#chat-window {
    flex: 1;
    padding: 10px;
    overflow-y: auto;
    border-bottom: 1px solid #ddd;
    min-height: 500px; /* ensure height for messages */
}
.message {
    margin: 5px 0;
    padding: 8px;
    border-radius: 5px;
    max-width: 80%;
}
.user {
    background: #DCF8C6;
    align-self: flex-end;
}
.bot {
    background: #eee;
    align-self: flex-start;
}
.input-area {
    display: flex;
    border-top: 1px solid #ddd;
}
input {
    flex: 1;
    padding: 10px;
    border: none;
    outline: none;
}
button {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
}
button:hover {
    background: #45a049;
}