How to create inner text shadow

it's very simple

.text_css{
font-size:5em;
  color:transparent;
  text-shadow:3px 3px 2px rgba(0,0,0,0.4);
  -moz-text-shadow:3px 3px 2px rgba(0,0,0,0.4);
  -webkit-text-shadow:3px 3px 2px rgba(0,0,0,0.4);
}

Live Demo