html,
body {
  position: relative;
  height: 100%;
}

body {
  background: #222;
  font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
  font-size: 14px;
  color: #000;
  margin: 0;
  padding: 0;
}

.swiper {
  width: 80vw;
  height: 80vh;
  margin: 0 auto;
}

.swiper-slide {
  background-position: center;
  background-size: cover;
}

.swiper-slide img {
  display: block;
  width: 100%;
}