How to reference this line in CSS, HTML

[Marmumu]

I am still new to CSS and HTML in general, so my knowledge is limited. I want to move some style code into css out of my HTML code. I have this:\[code\]<fieldset class="login"> ... <asp:Button class="mybutton" ID="_login" runat="server" Text="Login" style="float:right; margin-right:20px;"/> ...</fieldset>\[/code\]And in CSS i reference the entire login box like this:\[code\]fieldset.login{ ...}\[/code\]but what I can't figure out is the equivalent of "fieldset.login" so that I can reference the \[code\]<asp:Button>\[/code\] line. I've tried\[code\]fieldset.login Button {}\[/code\]And other things similar, but they don't seem to work for me. Thanks for your help.