.slideshow {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slide-img {
    width: 100%;
    max-height: 80vh;
    object-fit: contain;
    display: block;
    filter: brightness(0.8);
    mask-image: radial-gradient(ellipse 75% 75% at center, black 55%, transparent 85%);
    -webkit-mask-image: radial-gradient(ellipse 85% 85% at center, black 45%, transparent 85%);
}

.arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #fff;
    font-size: 3rem;
    cursor: pointer;
    opacity: 0.2;
    transition: opacity 0.2s;
    padding: 0 0.5rem;
    line-height: 1;
    z-index: 1;
}

.arrow:hover {
    opacity: 0.8;
}

.arrow-left { left: 0; }
.arrow-right { right: 0; }