app/views/home/_browser_window.html.erb
<div class="browser-window">
<header class="browser-window__header">
<div class="browser-window__button red-button"></div>
<div class="browser-window__button yellow-button"></div>
<div class="browser-window__button green-button"></div>
</header>
<div class="browser-window__viewport intrinsic-ratio-container">
<%= image_tag "/images/promo/lqip_#{image_file}",
data: { src: "/images/promo/#{image_file}" },
alt: alt, class: "lazyload blur-up intrinsic-ratio-image img-fluid" %>
</div>
</div>