.swiper {
  width: 100%;
  height: 510px;
}

.btn_next{
  width: 40px;
  height: 40px;
  position: absolute;    
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  z-index: 9; /* 이거 없으면 가려져서 안보임 */
  text-align: center;
}
.btn_prev{
  width: 40px;
  height: 40px;
  position: absolute;    
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  z-index: 9; /* 이거 없으면 가려져서 안보임 */
  text-align: center;
}
.btn_next>i,.btn_prev>i{
  font-size: 40px;
  color: #fff;
}
.pagination{
  position: absolute;
  z-index: 9;
  text-align: center;
}
.pagination>span{
  background-color: #fff;
}

.swiper-slide {
  text-align: center;
  font-size: 18px;
  background: #fff;
  /* Center slide text vertically */
  display: -webkit-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  -webkit-align-items: center;
  align-items: center;
}

.swiper-slide img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}