body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f5f5f5}.container{max-width:800px;margin:0 auto;padding:20px}h1{text-align:center;color:#333}.message-form{background-color:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 4px #0000001a;margin-bottom:20px}.form-group{margin-bottom:15px}.form-group label{display:block;margin-bottom:5px;font-weight:700}.form-group input,.form-group textarea{width:100%;padding:8px;border:1px solid #ddd;border-radius:4px}.form-group textarea{height:100px}button{background-color:#4caf50;color:#fff;border:none;padding:10px 15px;border-radius:4px;cursor:pointer;font-size:16px}button:hover{background-color:#45a049}.message-list{margin-top:20px}.message-card{background-color:#fff;padding:15px;border-radius:8px;box-shadow:0 2px 4px #0000001a;margin-bottom:15px}.message-title{font-size:18px;margin-bottom:10px;color:#333}.message-description{color:#666}.message-timestamp{font-size:12px;color:#999;text-align:right;margin-top:10px}