body { margin:0; font-family:Arial; background:#f4f4f4; }
header { background:#333; color:white; padding:20px; text-align:center; }
nav { background:#444; text-align:center; padding:10px; }
nav a { color:white; text-decoration:none; margin:0 10px; }
.container { max-width:900px; margin:auto; padding:20px; }
.post { background:white; padding:20px; border-radius:5px; margin-bottom:20px; }
textarea { width:100%; height:200px; }