Trying to add a slow fade in animation to the embedded content on my site (videos and Tweets)

Hey all - wondered if there's a way to replicate the slow fade in animation that I currently have on my site for text and images for the embedded content (primarily Tweets) - as this appears pre-loaded whilst all the other content fades in around it. Any help would be greatly appreciated. 

Cheers,

Ben

Hi,

What is your site url?

Http://benjackthomas.com