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Full-width images with only css

Today, I want to show you a simple CSS trick you can use to make images (or any other content) go full-width or full-bleed—from one edge of the page to the other—when the rest of your content is not.

Here’s the CSS:

.full-width {
	left: 50%;
	margin-left: -50vw;
	margin-right: -50vw;
	max-width: 100vw;
	position: relative;
	right: 50%;
	width: 100vw;

Add it to any element you want to run edge-to-edge, like this.

<p>The majority of a sea turtle's body is protected by its shell.</p>

<p><img class="full-width" alt="A sea turtle swimming in the ocean" src=""></p>

<p>In general, sea turtles have a more fusiform body plan than their terrestrial or freshwater counterparts. The reduced volume of a fusiform (tapering at both ends) body means sea turtles cannot retract their head, legs, and arms into their shells for protection like other turtles can.</p>

I can’t remember where I first saw this technique, but I’m 99.99999% sure it was from the amazing Mina Markham.

Here’s a demo.