.grav-vimeo {
  position: relative;
  overflow: hidden;
  display: block;
  margin: 0 auto;
  height: 0;
  padding: 56.25% 0 0 0;
  margin-bottom: 0;
  max-width: 1920px;
  max-height: 1080px;
}

.grav-vimeo iframe {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin: 0 auto;
}