smoothdog:

Live Preview | Code @ Pastebin (without back-link) | Code @ Pastebin (with back-link)

• Go to the Customize page of your Tumblr, click “Pages” on the top, “Add a page”.
• Type in a name and make sure you select “Custom Layout” from the dropdown menu.
• Now simply copy and paste the code into the box, edit as you please, and click “Create page”.
• DO NOT REMOVE THE CREDIT AT THE BOTTOM!
• Shoot me an ask if you have any questions.

Edit: How to change movie poster, title, and rating — here.

Edit 2: After so many people have send me asks, re: “How can I get a ‘back to my Tumblr’ link under the title of the page?” I now modified the code a little bit. You can now find a code for the one with, and the one without.