styles.css

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

#messages .toast-container {
    margin-bottom: 12px;
}

.background-user {
    background-color: #2372cc;
}

.background-assistant {
    background-color: #2c8310;
}

.error {
	color: #ff0000;
}