#books_pro
{
display:none;
width:670px;
}
#books_pro li
{
width:300px;
display:table;
text-align:center;
}
#books-prev
{
cursor:pointer;
font-weight:bold;
font-size:14px;
}
#books-next
{
cursor:pointer;
font-weight:bold;
font-size:14px;
}