.c-video-explain {
  text-align: center;
}

.c-video-explain .c-video-explain__title {
  margin-bottom: calc(var(--vw) * 24);
}

.c-video-explain > figure {
  width: 100%;
  @media (min-width: 1024px) {
    width: calc(var(--vw) * 640);
    margin: 0 auto;
  }
}

.c-video-explain > figure > iframe {
  width: 100%;
}