Solve a problem that may be related to css_html/css_WEB-ITnose

New to this technology
http://www.gli.cn/book_second_cate.php?cid=750
In the list of most clicks on the left side of this page, every time the mouse moves to the first book, the list Stretch them up and down
Please give me advice on how to solve this problem
The more detailed the better. Newcomers need advice

Reply to the discussion (solution)

margin The problem, .col_rig_book_show_a, .col_rig_book_show_b{} There is a margin-bottom in this class,,, it will be good to change it to margin-top

layout_style.css Line 2978 Delete margin-top:10px;
Line 2853 .gray_borde_b_bord{padding-bottom:10px;}