lazy-loaded responsive image for craftcms templates

img.twig

{% import '_inc/macros.twig' as macro %}
{% set imageQr = entry.image %}

{% if imageQr|length %}
    {% set image = imageQr.one() %}

        <img class="lazy"
             sizes="(min-width: 62.5rem) 62.5rem, 100vw"
             data-src="{{ macro.crop(image, 10/4, 1000) }}"
             data-srcset="{{-
                macro.crop(image, 10/4, 400) ~ ' 400w, ' ~
                macro.crop(image, 10/4, 700) ~ ' 700w, ' ~
                macro.crop(image, 10/4, 1000) ~ ' 1000w, ' ~
                macro.crop(image, 10/4, 1600) ~ ' 1600w' -}}"
        />
        
{% endif %}
{# macro.fit(image, 375) #}