'resize:none' works but with red underlined and reflects...

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ASP.NET

In order to stop the textbox width and height expansion by mouse pulling I used resize:none. It works but in the code it is underlined in red color and does not throw any error. AT the same time whenever there is anyother error appearing, this resize:none also joins with the error list.
Is there any correction to be made for safer side.

<asp:TextBox ID="TextBox8"     AutoPostBack="true"  runat="server" Textmode="multiline" width="644"  ForeColor="White" BackColor="DarkSeaGreen" Height="69"
                     style="z-index: 1; margin-top:6px; resize:none; left:1px"
                     ></asp:TextBox>

Thanks.