[TYPO3-RTE] new styles from dynamiccss are ignored

[Bartosz Aninowski]

I created new dynamicss file based on file from ext.
I added to my page TS config
RTE.default {
 contentCSS = fileadmin/template/main/dynamiccss1.css
 allowTags (
  a, abbr, acronym, address, blockquote, b, br, caption, cite, code, div, 
em, h1, h2, h3, h4, h5, h6, hr, i, img, li, link, ol, p, pre, q, sdfield, 
span, strong, sub, sup, table, thead, tbody, tfoot, td, th, tr, tt, ul, 
center, font, strike, u
 )
I enabled debug mode to see if htmlarea loads this file

[HTMLArea::initIframe]: Content CSS set to: 
http:.............../fileadmin/template/main/dynamiccss1.css
Please tell why  my  new style
p.align-justify {text-align:justify;}
is ignored?