body {
            font-family: Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            background-color: #f0f0f0;
        }
        .container {
            background-color: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0,0,0,0.1);
        }
        input[type="text"] {
            width: 100px;
            padding: 5px;
            margin: 5px;
        }
        button {
            padding: 5px 10px;
            margin: 5px;
            cursor: pointer;
        }
        #output {
            transition: background-color 0.3s;
        }
        #newTaskButton {
            display: none;
        }