Dont blink! - tribute page to Doctor Who

[Doru]

This is my first post on FreeCodeCamp forum and I would like to start by saying: "Hello World!"
Back on topic, here is my tribute page to Doctor Who TV Series. Any kind of feedback is greatly appreciated.
CodePen: http://codepen.io/doru-carp/pen/xRbMqd?editors=1000

[erretres]

Hi @Doru,

This code is not correct:

<h1 class="text-center">Doctor Who Tribute Page</h1>
  <h4 class="text-center">The man who saves the world</h4>

MDN documentation:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Heading_Elements

Do not use lower levels to decrease heading font size: use the CSS font-size property instead.
Avoid skipping heading levels: always start from <h1>, next use <h2> and so on.

Cheers and happy coding