.arrow-up {
  width: 0; 
  height: 0; 
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;

  border-bottom: 10px solid black;
}

.arrow-down {
  width: 0; 
  height: 0; 
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;

  border-top: 10px solid white;
}

.arrow-right {
  width: 0; 
  height: 0; 
  border-top: 20px solid transparent;
  border-bottom: 20px solid transparent;

  border-left: 20px solid white;
}

.arrow-left {
  width: 0; 
  height: 0; 
  border-top: 20px solid transparent;
  border-bottom: 20px solid transparent; 

  border-right:20px solid white; 
}

.swiper-button-prev, .swiper-button-next {
  background-image: none;
  opacity: 0.3;
}