CSS not working

Site URL: https://bit.ly/3yCuhgp

Hi. I'm trying to make a few CSS edits but it seems that is no working. For example I'm trying to round the corners of the videos targeting the video block whit this code:

#block-yui_3_17_2_1_1652714663019_4755 {

  border-radius : 25px!important;
  
  }

I also tried for doing it all at the same time:

.sqs-block-video img {
    border-radius: 18px !important;
}

But just work in the first video from the left and is not really round. It has in one end a nice curb and in the other a hard edge. I have that code right now. 

Regards

Thank you very much! This fixes both problems!