.filmik {
  display: flex;
  align-items: center;
  justify-content: center;
}

.nadole,
.nagorze {
  text-align: center;
  padding: 20px;
}

<!--RWD-->

@media screen and (min-width: 541px) and (max-width: 992px){
  .yt-film{
    width: 663px;
    height: 410px;
  }

}

@media screen and (max-width: 540px){
  .yt-film {
    width: 520px;
    height: 315px;
  }
}