if you use bootstrap css , its simple
add in page Title
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" />
in grid view add this class
<asp:GridView runat="server" ID="GridView1" CssClass="table table-responsive table-striped" >
for more information and Documentation go to this site :
https://getbootstrap.com/docs/4.0/content/tables/
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