body{background:#000;color:#0f0;font-family:Courier;}
.login{text-align:center;margin-top:100px;}
.layout{display:flex;height:80vh;}
#messages{flex:3;overflow:auto;}
#users{flex:1;background:#111;}
.input{position:fixed;bottom:0;width:100%;}
.header{background:#111;padding:10px;}