html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #000;
}

.layer {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transform-origin: center center;
}

.layer.visible {
    opacity: 1;
    z-index: 1;
    transition: opacity var(--fade-ms, 1500ms) ease-in-out;
}

.layer.animate {
    animation-name: kenburns;
    animation-duration: var(--kb-duration-ms, 8000ms);
    animation-timing-function: linear;
    animation-fill-mode: forwards;
}

@keyframes kenburns {
    from {
        transform: scale(var(--kb-scale-from, 1)) translate(var(--kb-x-from, 0%), var(--kb-y-from, 0%));
    }

    to {
        transform: scale(var(--kb-scale-to, 1)) translate(var(--kb-x-to, 0%), var(--kb-y-to, 0%));
    }
}

.empty-message {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ccc;
    font-family: system-ui, sans-serif;
    font-size: 1.5rem;
    text-align: center;
    padding: 2rem;
}

.empty-message[hidden] {
    display: none;
}