body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
   
    
   
}

h4 {
    text-align: center;
    font-size: 60px;
    font-weight: bold;
    color: black;
    font-style: italic;
    margin-top: 0;
}

#attempts {
    text-align: center;
    font-size: 18px;
    margin-top: 20px;
}

.game_board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 800px;
    margin: 40px auto;
    padding: 10px;
}

.card {
    width: 200px;
    height: 240px;
    cursor: pointer;
    perspective: 1000px; 
}

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

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden; 
}

.card-front {
    background-color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: rotateY(180deg); 
}

.card-back {
    background-color: #bbb;
    display: flex;
    justify-content: center;
    align-items: center;
}
.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden; 
}

.card-front img, .card-back img {
    width: 100%;
    height: 100%;
    object-fit: cover; 
}

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

#restartBtn {
    padding: 10px 30px;
    font-size: 20px;
    border: none;
    border-radius: 8px;
    background-color: #4CAF50;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
    position: fixed; 
    bottom: 20px; 
    left: 50%; 
    transform: translateX(-50%);
}

#restartBtn:hover {
    background-color: #45a049;
}