The embed images in 'Place' content type stretch to 100% width and does not retain the predefined sizes (small, medium, large etc.)

I embedded an image in the body of a Place content object.
When I publish this content object then in the sales demo this image is stretched to 100% in width.

Please see the attached screenshot.

EDIT (Sylvain):
The issue is related to https://github.com/ezsystems/ezstudio-demo-bundle/blob/master/Resources/public/css/content_types/place.css#L8
It should be

.content-image img {
    width: 100%;
}