.swiper-simple__btn:after {
    line-height: 1;
    font-size: 36px;
}

.swiper-simple__btn {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 50px;
    height: 100%;
    margin-top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: transparent;
    padding: 0;
    border: 0;    
}
.swiper-simple__btn--next {
    left: auto;
    right: 0;
}
.swiper-simple__btn--prev {
    right: auto;
    left: 0;
}
.swiper-simple__btn:after {
    text-shadow: 0px -2px 13px rgb(149 149 149);
}

@media (min-width: 1200px) {
    .swiper-simple__btn {
        opacity: 0;
        transition: opacity 0.3s ease-in-out;
    }
    
    .swiper-simple:hover .swiper-simple__btn {
        opacity: 0.8;
    }
    .swiper-simple__btn:hover {
        opacity: 1;
    }
}

@media (max-width: 575.98px) {
    .swiper-simple__btn {
        opacity: 0.8;
    }
    .swiper-simple__btn:after {
        font-size: 16px;
    }
}