title: How to create transparent button using gtk in c
body: <p>I want to add transparent button in my application and i am using gtk. How to do it?
  I am using <code>gtk_color_button_set_alpha()</code>:</p>
  
  <pre><code>gtk_color_button_set_alpha(GtkColorButton *button, guint16 100);
  </code></pre>
  
  <p>But it is giving error as</p>
  
  <blockquote>
    <p>error: expected expression before ‘GtkColorButton’
    error: too few arguments to function ‘gtk_color_button_set_alpha’</p>
  </blockquote>