<script runat="server">
Sub submit(Source As Object, e As EventArgs)
   button1.Style("background-color")="#0000ff"
   button1.Style("color")="#ffffff"
   button1.Style("width")="200px"
   button1.Style("cursor")="pointer"
   button1.Style("font-family")="verdana"
   button1.Style("font-weight")="bold"
   button1.Style("font-size")="14pt"
   button1.Text="You clicked me!"
End Sub
</script>

<!DOCTYPE html>
<html>
<body>

<form runat="server">
<asp:Button id="button1" Text="Click me!" runat="server" OnClick="submit" />
</form>

</body>
</html>