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

.container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

img,
video {
    max-width: 100%;
    max-height: 100%;
    display: none;
    object-fit: contain;
}

.active {
    display: block;
}