css add play button over image code example

Example: css play button on image

.more_video_img {
  position: relative;
}

.playBtn {
  position: absolute;
  width: 40px;
  height: 40px;
  left: 50%;
  top: 50%;
  margin-left: -20px; /*half of the width */
  margin-top: -20px; /*half of the height */
}