html, body {
    margin: 0;
    padding: 0;
}

body {
    background-color: #000;
    overflow: hidden;
}

#photo-wall {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    grid-auto-rows: 50px;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    gap: 2px;
}

.photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    animation: fadeInOut 15s infinite alternate;
    will-change: opacity;
    transition: filter 0.5s ease;
    filter: grayscale(100%);
}

.photo:hover {
    filter: grayscale(0%);
    transform: scale(1.1);
    z-index: 10;
    position: relative;
}

@keyframes fadeInOut {
    0% {
        opacity: 0;
    }
    20% {
        opacity: 0.8;
    }
    80% {
        opacity: 0.8;
    }
    100% {
        opacity: 0;
    }
}