ant-design/style/components/carousel/slick-theme.less

/* Arrows */

.slick-prev,
.slick-next {
  position: absolute;
  display: block;
  height: 20px;
  width: 20px;
  line-height: 0px;
  font-size: 0px;
  cursor: pointer;
  background: transparent;
  color: transparent;
  top: 50%;
  margin-top: -10px;
  padding: 0;
  border: none;
  outline: none;
  &:hover, &:focus {
    outline: none;
    background: transparent;
    color: transparent;
    &:before {
      opacity: 1;
    }
  }
  &.slick-disabled:before {
    opacity: 0.25;
  }
}

.slick-prev {
  left: -25px;
  &:before {
    content: "←";
  }
}

.slick-next {
  right: -25px;
  &:before {
    content: "→";
  }
}

/* Dots */

.slick-slider {
  padding-bottom: 45px;
}

.slick-dots {
  position: absolute;
  bottom: 0px;
  list-style: none;
  display: block;
  text-align: center;
  padding: 0;
  width: 100%;
  li {
    position: relative;
    display: inline-block;
    height: 20px;
    width: 20px;
    margin: 0 5px;
    padding: 0;
    cursor: pointer;
    button {
      border: 0;
      background: transparent;
      display: block;
      height: 20px;
      width: 20px;
      outline: none;
      line-height: 0px;
      font-size: 0px;
      color: transparent;
      padding: 5px;
      cursor: pointer;
      &:hover, &:focus {
        outline: none;
        &:before {
          opacity: 1;
        }
      }
      &:before {
        position: absolute;
        top: 0;
        left: 0;
        content: "•";
        width: 20px;
        height: 20px;
        font-size: 18px;
        font-family: arial, sans-serif;
        line-height: 20px;
        text-align: center;
        color: gray;
        opacity: 0.25;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
      }
    }
    &.slick-active button:before {
      color: black;
      opacity: 0.75;
    }
  }
}

.ant-carousel-vertical {

  .slick-slider {
    padding-bottom: 0;
  }

  .slick-dots {
    width: 20px;
    bottom: auto;
    right: -35px;
    top: 0;
  }
}