body { font-family: sans-serif; background-color: #f4f4f9; color: #333; margin: 0; padding: 20px; }
.container { max-width: 600px; margin: auto; background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
h1 { text-align: center; color: #444; }
form { display: flex; margin-bottom: 20px; }
input[type="text"] { flex-grow: 1; padding: 10px; border: 1px solid #ddd; border-radius: 4px; }
button { padding: 10px 15px; border: none; background-color: #007bff; color: white; border-radius: 4px; cursor: pointer; margin-left: 10px; }
button:hover { background-color: #0056b3; }
#messages-container p { background: #e9ecef; padding: 10px; border-radius: 4px; border-left: 3px solid #007bff; margin-bottom: 10px; }