body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 20px;
            background-color: #f8f8f8;
        }

        .navbar {
            background-color: #333;
            overflow: hidden;
        }

        .navbar a {
            float: left;
            display: block;
            color: white;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none;
            transition: background-color 0.3s;
        }

        .navbar a:hover {
            background-color: #555;
        }
		h1 {
            text-align: center;
            margin-bottom: 20px;
        }
        .card-container {
			display: flex;
            flex-wrap: wrap;
            justify-content: center;
            max-width: 2000px;
        }

        .card {
            width: 150px;
            height: 200px;
            margin: 10px;
            perspective: 1000px;
            cursor: pointer;
            position: relative;
        }

        .card-inner {
            width: 100%;
            height: 100%;
            transform-style: preserve-3d;
            transition: transform 0.5s;
        }

        .card.unmatched .card-inner {
            transform: rotateY(180deg);
        }

        .card.matched .card-inner {
            transform: rotateY(180deg) scale(0);
        }

        .card-face {
            width: 100%;
            height: 100%;
            position: absolute;
            backface-visibility: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            background-color: #1e90ff;
            color: #fff;
            border-radius: 5px;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
            cursor: pointer;
        }

        .card-back {
            transform: rotateY(180deg);
            background-color: #f2f2f2;
            color: #333;
        }