Designer Tip: Alignment of text, justify or center is not recommended

Jus­ti­fied text is spaced so the left and right sides of the text block both have a straight edge. Jus­ti­fi­ca­tion works by adding white space between the words in each line so all the lines are the same length.

If you’re us­ing jus­ti­fied text, you must also turn on hy­phen­ation so you don’t get grue­somely large spaces be­tween words. Unfortunatly hyphenation is not widely supported in internet browsers which is why justified text is usually discouraged on the web.

Read more about this in this article about Justified Text.