Cannot choose text style in RTE

In the Page TSConfig on the root page I have the following code:

/////////////////////////////////////////////////////////////
//    RTE
///////////////////////////////////////////////////////////// 
RTE.classes{
  highlight{
      name = highlight
      value = color:#636466; font-size:15px;
  } 
  brown{
      name = braun
      value = color:#9A3811;
  }
}

RTE.default{
  ignoreMainStyleOverride = 1 
  useCSS = 1
  contentCSS = fileadmin/templates/css/rte.css
  classesCharacter := addToList(highlight, brown)
  classesParagraph := addToList(highlight, brown)
  proc.allowedClasses := addToList(highlight, brown)
  showTagFreeClasses = 1
}

In my rte.css I have this:

/* content of rte.css */

.highlighthighlight {
    font-size: 15px;
    color: #636466;
}

.brown {
    color: #9A3811;
}

The same style is in style.css for the frontend. If I'm in the editor I cannot choose a text style. It is always disabled. I want to mark some words in a paragraph. I tried to use different browsers (IE, FF, Opera …) but in all of them text style is disabled. What can I do?

I have Typo3 4.7.5

EDIT

The problem was due to deprecated properties (see here)). My current code looks like

/////////////////////////////////////////////////////////////
//    RTE
///////////////////////////////////////////////////////////// 
RTE.default{
  ignoreMainStyleOverride = 1 
  useCSS = 1
  contentCSS = fileadmin/templates/css/rte.css
  proc.allowedClasses := addToList(highlight, brown)
  buttons {
    blockstyle.tags.div.allowedClasses := addToList(highlight, brown)
    textstyle.tags.span.allowedClasses := addToList(highlight, brown)
  }
  showTagFreeClasses = 1
}

RTE.classes{
  highlight{
      name = highlight
      value = color:#636466; font-size:15px;
  } 
  brown{
      name = braun
      value = color:#9A3811;
  }
}

Now I can choose a text style, but only one of them. Also the name of one block style is wrong …