body { font-family: Arial; margin:0; background:#f4f6f8 }
header, footer { background:#111; color:#fff; padding:10px; text-align:center }
main { padding:20px }
input, button, select { padding:8px; margin:6px 0; width:100% }
.user { background:#fff; padding:8px; margin:5px 0; display:flex; justify-content:space-between }
.online { color:green }
.busy { color:orange }
.offline { color:red }