#chatbot-box{
position:fixed;
bottom:20px;
right:20px;
width:300px;
background:white;
border:1px solid #ccc;
padding:10px;
}

#chat-messages{
height:200px;
overflow-y:auto;
}

.student{
text-align:right;
background:#d1e7dd;
margin:5px;
padding:5px;
}

.bda{
text-align:left;
background:#f8d7da;
margin:5px;
padding:5px;
}