A Welcome Picture

Try adding an image to the “Wide” sidebar and apply this style to it:

#wrapper {
	overflow: visible;
}

img.full-screen {
	max-width: none;
	width: 100vw;
	margin-left: calc(100% - (100vw / 2 + 100% / 2));
}

It won’t work in outdated browsers.

You have to give the image the “full-screen” class:

<img class="full-screen" src="..." />

I’ve done a mistake in the CSS above, I have updated it to reflect the correct code.

If you want it in a different location, you’ll have to hard code it in header.php. If you want it above the navigation you’ll have to insert it above <nav id="access">.

You may also want to add display: block; to .full-screen