@media screen and (max-width: 400px) {
  .yesp .yesp-container {
    float: none;
    width: auto !important;
    height: auto !important;
  }
    .yesp .yesp-container iframe {
      width: 100% !important;
      height: auto !important;
    }
    .yesp .yesp-playlist {
      width: 100% !important;
      height: 300px !important;
    }
    .yesp .yesp-playlist-video {
      float: left;
      width: 33% !important;
    }
}