.gr_grid_container {
    align-items: center;
    width: 700px;
    display: flex;
    flex-wrap: wrap;
    /* customize grid container div here. eg: width: 500px; */
}

.gr_grid_book_container {
    /* customize book cover container div here */
    float: left;
    width: 98px;
    height: 160px;
    padding: 0px 0px;
    overflow: hidden;
    align-items: center;
}

.position {
    display: flex; 
    flex-wrap: wrap; 
    justify-content: center; 
    align-items: center; 
    padding: 10px;
}