Scroll: auto not working in IE8 - internet-explorer-8

Question

Anybody help me, i have a website: http://sugo.vn/Tin-tuc and my scroll: auto not working in IE8
My css:
.div_over {
float: right;
height: 345px;
max-width: 98%;
min-width: 98%;
overflow: auto;
width: 98%;
padding: 0px 7px; }
ul.list_news, ul.list_tuyendung {
list-style: none outside none;
position: inherit;
width: 100%;
}
ul.list_news li, ul.list_tuyendung li {
float: left;
list-style: none outside none;
margin-bottom: 5px;
margin-right: 5px;
width: 99%;
}
Bind data
div class="div_over">
<asp:Panel ID="PNListNews" runat="server">
<ul class="list_news">
<asp:Repeater ID="DTLListNews" runat="server">
<ItemTemplate>
<li>
<asp:Image ID="Image1" runat="server" ImageUrl='<%#Eval("ImageSmall")%>' ToolTip='<%#Eval("Title")%>' />
<asp:LinkButton ID="lbtListNews" CommandName="details" CssClass="list_new" CommandArgument='<%#Eval("Id")%>' runat="server"><%#Eval("Title")%></asp:LinkButton>
<asp:Label ID="lblTitle" runat="server" Text='<%#Eval("Title")%>' Visible="false"></asp:Label>
</li>
</ItemTemplate>
</asp:Repeater>
</ul>
</asp:Panel>
</div>
I have searched but some solution not work for me :(

Answer 1

pre
{
max-height: none\9
}
won't validate, but should work in ie8 standards