Embedded Video looses qualitiy

Hi, after embbedding a video, the quality is loosing (sharpness) . Take a look to the short VIDEO in the footer under the google-map of:

After open the beaver builder to edit and scrolling into the row or on the video-modul, the video becomes a perfect clear quality. After scolling out or closing the beaver builder, the quality is loosing sharpness ansdgetting milky.

I´m using the builder, the theme and themer.

Can i fix with any layout css on global settings?