Embedded video from Vidtags software is not resizing on the mobile devices – like YouTube or Vimeo.

Site URL: https://tilnak.com

Embedded video from Vidtags software he's not resizing on the mobile devices – like YouTube or Vimeo.

I have seen this problem coming up time after time on squarespace. What is the exact procedure so that the video is normal-size on desktop but it's reduce to the same window size like YouTube and Vimeo but using the embed tool instead.

Also, because I am hosting my videos on "Vidtags", can I use the URL where it is being hosted?

I have taken the videos off my site because I can't leave them the way they are.

Please help ASAP