Interlining between posts from the blog on my home page

Hi everybody,

I need to remove the interlining between posts from the blog on my home page . I used this code to put my blog on my home page in home.aspx:

<CSBlog:WeblogPostList runat="Server" >
      <QueryOverrides IsAggregate="true" PageSize="5" />
         <ItemTemplate>
                 <CSBlog:WeblogPostData Property="Subject" LinkTo="Post" Tag="H5" CssClass="BlogPostHeader" runat="server" />
         </ItemTemplate>
</CSBlog:WeblogPostList>

 But the result is like you can see on http://communautes-numeriques.com/ =/

Anyone can help me to do it please ?

Thanks,

 William