Replace or Remove DNN's Default CSS

NoDefaultCss.ascx

<%@ Register TagPrefix="dnn" Namespace="DotNetNuke.Web.Client.ClientResourceManagement" Assembly="DotNetNuke.Web.Client" %>

<dnn:DnnCssExclude runat="server" Name="dnndefault" />

UseVersion8DefaultCss.ascx

<%@ Import Namespace="DotNetNuke.Web.Client" %>
<%@ Register TagPrefix="dnn" Namespace="DotNetNuke.Web.Client.ClientResourceManagement" Assembly="DotNetNuke.Web.Client" %>

<dnn:DnnCssInclude runat="server" 
                   FilePath="~/resources/shared/stylesheets/dnndefault/8.0.0/default.css"
                   Priority="<%#FileOrder.Css.DefaultCss%>" 
                   Name="dnndefault" 
                   Version="8.0.0" />