Describe the bug
I selected to align video to center, but the frontend shows it on the left side of the screen.
The caption is seen in the center of the screen

To Reproduce
Steps to reproduce the behavior:

1. Add a youtube video.
2. Add a caption.
3. Save/preview and check out where the video and caption is located.
4. Video is located on the left side of the screen. Caption is in center of page.

Expected behavior
That aligning center also aligns the video in the center of the screen. With the caption in alignment below it.

Screenshots

Gutenberg - backend. Showing caption and video.

Frontend:

Showing caption too far to the right.

Desktop (please complete the following information):

• Mac OS 10.13.6
• Browser Chrome and Desktop Server
• Gutenberg version 4.1.1