body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            margin: 0;
            padding: 20px;
        }
        h1 {
            color: #333;
            text-align: center;
        }
        #fileInput {
            display: block;
            margin: 20px auto;
            padding: 10px;
            font-size: 16px;
            border: 1px solid #ccc;
            border-radius: 5px;
        }
        #runButton {
            display: block;
            width: 100%;
            max-width: 200px;
            margin: 20px auto;
            padding: 10px;
            font-size: 16px;
            color: white;
            background-color: #007BFF;
            border: none;
            border-radius: 5px;
            cursor: pointer;
        }
        #runButton:hover {
            background-color: #0056b3;
        }
        #output {
            margin-top: 30px;
            padding: 20px;
            background-color: white;
            border: 1px solid #ccc;
            border-radius: 5px;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        }
        #dialog {
            display: none;
            border: 1px solid #ccc;
            background-color: white;
            padding: 20px;
            border-radius: 5px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 1000;
        }
        #overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 999;
        }