body{font-family:Arial,sans-serif;background-color:#fff;color:#000;display:flex;justify-content:center;padding:20px}.app-container{width:600px;border:1px solid black;padding:10px;background-color:#fff}h2{text-align:center}.message{border:1px solid black;padding:5px 10px;margin-bottom:10px;text-align:center;background-color:#fff}.post-container{border-bottom:1px solid black;padding-bottom:10px;margin-bottom:10px}textarea{width:98%;height:60px;border:1px solid black;padding:5px;resize:none}button{margin-top:5px;padding:5px 10px;border:1px solid black;background-color:#fff;cursor:pointer;font-size:14px}button:hover{background-color:#f0f0f0}.post-item{border-bottom:1px solid black;padding:10px 0}.post-item p{margin:0 0 5px}.post-item button{margin-right:5px;font-size:12px}.post-item button:last-child{margin-right:0}.app-footer{text-align:center;padding:10px;background-color:#000;color:#fff;margin-top:20px;border-top:1px solid #333}