.wrap {
  width: 1090px;
  margin: auto;
}

.slick li div {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
}

.slick li div iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

@media screen and (max-width:640px) {
  .wrap {
    width: 88%;
  }
}