
<style>
.puzzle-board {
    gap: 1px !important; /* narrower gaps between tiles */
    
}

/* Tile Styling */
.puzzle-board > div {
    border-radius: 6px;
    transition: transform 0.2s, box-shadow 0.2s;
}

/* Hover effect for movable tiles */
.puzzle-board > div:not(.bg-secondary):hover {
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

/* Empty tile custom color */
.puzzle-board > .bg-secondary {
    background-color: #555 !important; /* change empty tile color */
}

/* Number tiles */
.puzzle-board > .bg-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: bold;
    color: #fff;
    cursor: pointer;
}

/* Image tiles: optional border */
.puzzle-board > div[style*="background-image"] {
    border: 1px solid #ccc;
    cursor: pointer;
}

/* Shuffle button styling */
.btn-success {
    transition: background-color 0.2s, transform 0.2s;
}

.btn-success:hover {
    background-color: #28a745cc;
    transform: scale(1.05);
}</style>