Hide Button in mobile using Bootstrap

Hi kankon,

Please refer below updated code.

Use d-none d-md-block to show on medium, large and extra large devices and hide on small devices.

<asp:Button ID="btnExport" runat="server" Text="طباعة" CssClass="btn btn-primary d-none d-md-block" />

 Link

<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" />