#mainVisual .slick-next {
  right: 20px;
}
#mainVisual .slick-prev {
  left: 20px;
}

#mainVisual .slick-prev,
#mainVisual .slick-next {
  z-index: 1;
  display: block;
  width: 50px;
  height: 50px;
  background: transparent;
  border: 3px #fff solid;
  border-radius: 50%;
  transition: all 0.3s ease;
  cursor: pointer;
  opacity: 0.5;
}
#mainVisual .slick-prev:hover,
#mainVisual .slick-next:hover {
  opacity: 1;
}
#mainVisual .slick-prev {
  transform: rotate(180deg);
}

#mainVisual .slick-prev::before,
#mainVisual .slick-next::before {
  opacity: 1;
  position: absolute;
  content: "";
  width: 16px;
  height: 16px;
  border-right: 3px solid #fff;
  border-top: 3px solid #fff;
  top: 0;
  bottom: 0;
  left: -5px;
  right: 0;
  margin: auto;
  transform: rotate(45deg);
}

@media screen and (max-width: 768px) {
  #mainVisual .slick-prev,
  #mainVisual .slick-next {
    width: 30px;
    height: 30px;
    border-width: 2px;
  }
  #mainVisual .slick-prev::before,
  #mainVisual .slick-next::before {
    width: 10px;
    height: 10px;
    border-width: 2px;
  }
}