size of embedded youtube movie

Hi, I embedded youtube movie to my site (https://vectology.jp/products/waqg/). The movie size was fixed with belowing code, but it appears as full-size. <iframe width="560" height="315" src="https://www.youtube.com/embed/thUvFDLwDAc" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe> Could you let me know how I can fix this issue? Thank you, Sumiko