create icon that shows on favorites page in safari
I dunno if this is right place to find answer but I have found nothing. So in safari, when I open new tab or window it shows all my favorites, some of them have icons and some of them have just a letter. How do I make it so that my website will have an icon? I assume it's something simple like when creating icons that show up when saving a website to home screen on like iPhone, but I can't figure it out.
MacBook Pro (Retina, Mid 2012), OS X El Capitan (10.11)