pictures.html

<picture>
    <source
        media="(max-width: 979px)"
        type="image/jpg"
        srcset="
            illu-telephone-center_mobile.png 1x,
            illu-telephone-center_mobile@2x.png 2x
        "
    >
    <source
        media="(min-width: 978px)"
        type="image/jpg"
        srcset="
            illu-telephone-center_desktop.png 1x,
            illu-telephone-center_desktop@2x.png 2x
        "
    >
    <img
        src="illu-telephone-center_desktop.png"
    />
</picture>