By default Iridize videos are setup to be responsive and fit in any screen.
When taking advantage of this responsiveness, the alignment option (see image below) is obsolete.
When embedding a video you have 2 options:
- Use the responsive video and not use the align left/right option (set alignment to none. the width of the tip will be adjusted to fit the video and the screen automatically)
- Disable the responsiveness by setting a width to the tip in pixels (under the display settings) and not in %.