img {
max-width: 100%;
}
<picture alt="Our Alternate Text">
<!-- Smallest size first - no @media qualifier --> <source src="content-image.jpeg" />
</picture>
<picture alt="Our Alternate Text">
<!-- Smallest size first - no @media qualifier -->
<source src="content-image.jpeg" />
<!-- Large size - send to viewports 800px wide and up -->
<source src="content-image-lrg.jpeg" media="(min-width:
800px)" />
</picture>
<picture alt="Our Alternate Text">
<!-- Smallest size first - no @media qualifier -->
<source src="content-image.jpeg" />
<!-- Large size - send to viewports 800px wide and up -->
<source src="content-image-lrg.jpeg" media="(min-width:
800px)" />
</picture>
<!-- Fallback content for non-JS or non-media-query- supporting-browsers -->
<noscript>
<img src="content-image.jpeg" alt="Our Alternate
Text" />
</noscript>
</picture>