.no-webp .g-kvbg {background-image:url(https://www.narakathegame.com/pc/gw/20210601195432/img/kv-bg_171fa9fb.jpg);
  background-size: cover}
.webp .g-kvbg {background-image:url(https://www.narakathegame.com/pc/gw/20210601195432/img/kv-bg_171fa9fb.webp);
  background-size: cover}
.no-webp .g-kvbg {background-size:cover}
.webp .g-kvbg {background-size:cover}
.g-kvbg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.g-kvbg video {
  position: absolute;
  top: 0;
  left: 50%;
  width: 100%;
  min-width: 1920px;
  min-height: 100%;
  -webkit-transform: translate(-50%, 0);
          transform: translate(-50%, 0);
  -o-object-fit: cover;
     object-fit: cover;
}