Different sizes when embedding videos

Hello, when I upload a video via direct link from youtub, it is added in a huge way. Something in XenForo, which I show in the pictures, supports several sites. It is added in a small way as shown in the picture.

In our case, HTML needs to be activated in the easiest way and there is a warning like unsafe html. Of course, it would be annoying and a simpler way.

In our case, I added pictures showing how it happened and how it looked.

I used 5.3 RC 1 as version.

Thank you. Well, can full screen and shrink option be offered within the embedded video as in the pictures?

Quote from Marcel Werk

CSS

.videoContainer {
    width: 560px;
    height: 315px;
    padding-bottom: 0;
    
    iframe, video {
        position: static;
    }
}

I will have one more question. This way the videos are just aligned to the left. Is there any way to adjust the alignment as we want? margin: auto; when I use it it is just averaged as an alignment. I want it to be able to move left right or middle whenever I want.

Quote from cls-design

Does alignment not work with videos?

After adding the above code to small size the videos. yes, unfortunately it doesn't work.