#include <gtk/gtk.h>

GtkWidget* create_entry() {
  GtkWidget *entry = gtk_entry_new();

  /* style this entry, directly. */
  const gchar *css_string = "entry { color: red; }";
  GtkCssProvider *css = gtk_css_provider_new();
  gtk_css_provider_load_from_data(css, css_string, -1, NULL);
  gtk_style_context_add_provider(gtk_widget_get_style_context(entry),
                                 GTK_STYLE_PROVIDER(css),
                                 GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
  g_object_unref(css);

  return entry;
}

void init() {
  GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  GtkWidget *entry = create_entry();

  gtk_container_add(GTK_CONTAINER(window), entry);
  gtk_widget_show_all(window);

  g_signal_connect(window, "destroy", gtk_main_quit, NULL);
}

int main(int argc, char **argv) {
  gtk_init(&argc, &argv);

  init();
  gtk_main();
  return 0;
}