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Google ÜberProxy's Easter egg

It looks like the http://corp.google.com/ page has a fun Easter egg.

The page looks like a normal error page:

ÜberProxy: Error 400

But if you hover over the "What's ÜberProxy?" link, it shows a hidden Easter egg:

ÜberProxy: Error 400 with an Easter egg

To show/hide the "ÜP" image, it uses a simple CSS rule:

.easter-egg {
  display: none;
}

a.footer-link:hover + div.easter-egg {
  display: block;
}

The image is directly embedded in the HTML as a data URI:

ÜP Easter egg

In the old versions of the page, the image was always visible (https://web.archive.org/web/20130716091355/http://corp.google.com/):

Old version

See also

Fun Easter eggs in the BukyVede font.

Browse ASCII art and Easter eggs.

Fun hieroglyphic Easter eggs in the Aegyptus font.

All prices listed are in United States Dollars (USD). Visual representations of products are intended for illustrative purposes. Actual products may exhibit variations in color, texture, or other characteristics inherent to the manufacturing process.