When you get the embed code from a video, often it will give you set sizes to display the video in. If you want the video to fill the full width of its container then use this shortcode to help it like the video below.
How to insert a Fluid Width Shortcode
Fluid Width can be added in the visual editor “Insert Shortcode” dropdown.
- Click the icon and go to Media > Fluid Width Video to bring up the shortcode insert window.
- Paste your YouTube video URL.
- Click OK to insert the shortcode on the page.