Making your video player fit to the post container.

As Tumblr supports a variety of video players, such as Vimeo, Youtube, Tumblr Video player, Vine, Soundcloud, and etc, they are sometimes not fit to the post container. To prevent this issue, we recommend you to follow this step:

  • Go to Custom CSS. You can find out how to get to there here.
  • Add the following code in the Custom CSS inbox.
/** make sure you put this before  **/
/** This CSS fixes the over-sized video players on Tumblr **/
/** Editered on September 19 2015**/
p figure iframe, figure iframe, .tumblr_video_container, .tumblr_video_container iframe{width:100%}
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