.tlk-lectures__course-card-img {
  opacity: 0;
}

.tlk-lectures__course-card-content-left {
  position: relative;
}

.tlk-lectures__course-card-content-left::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 40px; /* подгони под размер */
  height: 40px;
  background-image: url('https://static.tildacdn.com/lib/icons/tilda/-/paint/ff0000--1-50-58/video_player_webinar.svg');
  background-size: contain;
  background-repeat: no-repeat;
}