Flex视频

// Flex Video Based on Zurb Foundation 
.flex-video {
  position: relative;
  height: 0;
  padding-bottom: 75%;
  margin-bottom: 1rem;
  overflow: hidden;
}

.flex-video iframe,
.flex-video object,
.flex-video embed,
.flex-video video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.flex-video.widescreen {
  padding-bottom: 56.25%;
}

.flex-video.vimeo {
  padding-top: 0;
}