How to remove GTK entry border?

[Alexander Medvednikov <alexander medvednikov com>]

Hello,

Right now my textbox looks like this:

https://i.imgur.com/cK5tDjd.png

I want there to be no border at all. I tried the following code without any luck:

GtkCssProvider *provider = gtk_css_provider_new ();

gtk_css_provider_load_from_data (GTK_CSS_PROVIDER (provider), 

"entry, .entry, GtkEntry { border-width:0px ; }", 

-1, NULL); 

GdkDisplay *display = gdk_display_get_default ();

GdkScreen *screen = gdk_display_get_default_screen (display);

gtk_style_context_add_provider_for_screen (screen, GTK_STYLE_PROVIDER     

         (provider), GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);

I'm using libgtk-4-0/artful 3.90.0-0ubuntu2 amd64

Thanks a lot!

-Alex