Some values of display trigger the creation of anonymous boxes around the original box. It’s the outermost box—the direct child of the flex container box—that becomes a flex item. Note: the first and last spaces are not equal to all the other spaces between items. It is not an error: http://curso-de-flexbox75209.xzblogs.com/37672231/5-fatos-f-ceis-sobre-o-que-flexbox-descrito