img {
  max-width: 100%;
  height: auto;
  display: block;
}
body {
  font-size: 16px;
  line-height: 1.5;
}
.uk-cover-container {
  position: relative;
  overflow: hidden;
}
.uk-cover-container::before {
  content: "";
  display: block;
  padding-top: calc(9 / 16 * 100%); /* 16:9 */
}
.uk-cover-container > img[uk-cover] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}