.header-swiper {
    position: relative;
}

.header-swiper .swiper-pagination-bullet {
    width: 16px;
    height: 16px;
    background-color: #e6e6e6;
    /* 任意の色 */
    opacity: 0.8;
}

.header-swiper .swiper-pagination-bullet-active {
    opacity: 1;
    background-color: #000;
    /* アクティブ時の色 */
}