.bg-image(@url) {
    background-image: url('@{url}');
}

.bg-image-width-device(@url) {
    background-image: url('@{url}.png');

    @media (-webkit-min-device-pixel-ratio: 2),
    (min-device-pixel-ratio: 2) {
        background-image: url('@{url}@2x.png');
    }

    @media (-webkit-min-device-pixel-ratio: 3),
    (min-device-pixel-ratio: 3) {
        background-image: url('@{url}@2x.png');
    }
}

.center() {
    display: flex;
    justify-content: center;
    align-items: center;
}