* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f0f0f0;
    transition: background-color 1s ease;
}

body.green-bg {
    background-color: #314432;
}

.muted {
    position: fixed;
    text-align: center;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 24px;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: 100;
    user-select: none;
}

.muted.visible {
    opacity: 1;
}

.images {
    position: relative;
    width: 0;
    height: 0;
}

.overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 90vw;
    max-height: 90vh;
    width: auto;
    height: auto;
    user-select: none;
    -webkit-user-drag: none;
    visibility: visible;
    opacity: 1;
    filter: grayscale(100%);
    transition: filter 1s ease, opacity 0.3s ease;
}

.overlay.color {
    filter: grayscale(0%);
}

.overlay.is-hidden {
    visibility: hidden;
    opacity: 0;
}