You can give styles for each item in the grid (ItemStyle), each alternating item (AlternatingItemStyle), the Header (HeaderStyle), the Footer (Footstyle), and for a selected item (SelectedItemStyle).
HTML Code:
<asp:datagrid id="dgrGrid" Runat="server">
<SelectedItemStyle CssClass="datagridSelected"></SelectedItemStyle>
<AlternatingItemStyle CssClass="datagridAlternate"></AlternatingItemStyle>
<ItemStyle CssClass="datagridItem"></ItemStyle>
<HeaderStyle CssClass="datagridHeader"></HeaderStyle>
<FooterStyle CssClass="datagridFooter"></FooterStyle>
<Columns></Columns>
</asp:datagrid>
And then in the CSS you can just add the elements.
For example:
Code:
.datagridItem
{
font-size: 12px;
color: black;
font-family: "Arial" , "Verdana" , "Tahoma";
background-color: #fefefe;
text-align: left;
height: 15px;
}