#chat-app {
    max-width: 400px;
    margin: auto;
    border: 1px solid #ddd;
    border-radius: 10px;
    overflow: hidden;
    font-family: sans-serif;
}

#chat-box {
    display: flex;
    flex-direction: column;
    height: 400px;
}

#messages {
    flex: 1;
    padding: 10px;
    overflow-y: auto;
    background: #f5f5f5;
}

.msg {
    background: #fff;
    padding: 10px;
    border-radius: 10px;
    margin: 5px;
}

.msg small {
    color: red;
    cursor: pointer;
    font-size: 10px;
}

#input-area {
    display: flex;
}

#input-area input {
    flex: 1;
    padding: 10px;
}

#input-area button {
    background: #25D366;
    color: white;
    border: none;
    padding: 10px;
}