asp.net paging changes height

title says it all, I have a gridview, and the second page does not fill the 10 places so it changes height, I need the gridview to stay the same no matter what. I will change to whatever I need to get this done, Ive tried everything I can find online like taking out the height attribute and moving it to css, nothing has worked. I also tried all of the answers here and they did not work either...GridView paging problem!

the CSS i tried is:

.RowStyle {
 height: 50px;
 }
 .AlternateRowStyle {
  height: 50px;
 }

and the HTML I am using currently is:

<asp:Panel runat="Server" ID="AnonymousMessagePanel">
         <br />
        <asp:GridView ID="CompletedProjectsGrid" runat="server" AllowSorting="True" AutoGenerateColumns="False" DataSourceID="ProjectsClosedList" 
            EnableViewState="False" DataKeyNames="ProjectID" CssClass="mGrid" PagerStyle-CssClass="pgr"  RowStyle-CssClass="RowStyle" 
            AlternatingRowStyle-CssClass="alt" AllowPaging="true" PageSize="10">
            <Columns>
                <asp:BoundField DataField="ProjectID" HeaderText="ProjectID" HeaderStyle-ForeColor="White" SortExpression="ProjectID" ReadOnly="True" ItemStyle-Width="11%"/>
                <asp:BoundField DataField="ProjectName" HeaderText="ProjectName" HeaderStyle-ForeColor="White" SortExpression="ProjectName" ItemStyle-Width="11%"/>
                <asp:BoundField DataField="TesterName" HeaderText="TesterName" HeaderStyle-ForeColor="White" SortExpression="TesterName" ItemStyle-Width="11%"/>
                <asp:BoundField DataField="ProjectDescription" HeaderText="ProjectDescription" HeaderStyle-ForeColor="White" SortExpression="ProjectDescription" ItemStyle-Width="11%"/>
                <asp:BoundField DataField="Platform" HeaderText="Platform" HeaderStyle-ForeColor="White" SortExpression="Platform" ItemStyle-Width="11%"/>
                <asp:BoundField DataField="DueDate" HeaderText="DueDate" HeaderStyle-ForeColor="White" SortExpression="DueDate" dataformatstring="{0:M/dd/yyyy}" ItemStyle-Width="11%"/>
                <asp:BoundField DataField="DateAssigned" HeaderText="DateAssigned" HeaderStyle-ForeColor="White" SortExpression="DateAssigned" dataformatstring="{0:M/dd/yyyy}" ItemStyle-Width="11%"/>
                <asp:BoundField DataField="DocumentName" HeaderText="DocumentName" HeaderStyle-ForeColor="White" SortExpression="DocumentName" ItemStyle-Width="11%"/>
            </Columns>
            </asp:GridView>
        <asp:SqlDataSource ID="ProjectsClosedList" runat="server" 
                   ConnectionString="<%$ ConnectionStrings:ProjectsAndTasksTestConnectionString %>" 
                   SelectCommand="SELECT [ProjectID], [ProjectName], [TesterName], [ProjectDescription], [Platform], [DueDate], [DateAssigned], [DocumentName] FROM [Projects] WHERE ([DateCompleted] IS NULL)">
               </asp:SqlDataSource>
    </asp:Panel>

Note: all of these ways do actually run and work, they just all change height of the gridview when there is only 2/10 on the last page, and I need it the same height no matter what is in the page