body{font-family:sans-serif;background:#f0f0f0;}
.login-box{width:300px;margin:100px auto;padding:20px;background:#fff;border-radius:10px;text-align:center;}
.chat-container{display:flex;width:700px;margin:50px auto;background:#fff;padding:10px;border-radius:10px;}
.sidebar{width:200px;border-right:1px solid #ccc;padding:5px;overflow-y:auto;height:400px;}
.chat-window{flex:1;height:400px;overflow-y:scroll;border:1px solid #ccc;padding:10px;margin-left:10px;}
#msgInput{width:60%;padding:5px;} #fileInput{width:20%;} #sendBtn{padding:5px;}