#btn-logo {
    padding: 16px;
    font-size: 42px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    pointer-events: none;
    font-family: 'custom-megrim';
    border-radius: 4px;

    text-shadow: 0px 0px 4px black, 0px 0px 8px black, 0px 0px 16px black, 0px 0px 32px black;
}

#img-corner {
    width: 40vw;
    height: auto;
    aspect-ratio: 1/1;

    position: fixed;
    left: 0;
    bottom: 0;

    border-radius: 0;
    object-fit: cover;
    mask-image: 
    linear-gradient(to left, transparent, black),
    linear-gradient(to bottom, transparent, black);
    mask-composite: intersect;

    /* Safari still needs the prefixed version with different keywords */
    -webkit-mask-image: 
        linear-gradient(to left, transparent, black),
        linear-gradient(to bottom, transparent, black);
    -webkit-mask-composite: source-in, source-in;
}

@media (orientation: portrait) {
    #img-corner {
        mask-image: 
        linear-gradient(to bottom, transparent, black);

        /* Safari still needs the prefixed version with different keywords */
        -webkit-mask-image: 
            linear-gradient(to bottom, transparent, black);
        -webkit-mask-composite: source-in, source-in;
        width: 100%;
        height: 30%;
    }
}