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Titles can be styled by matching the topic/title class attribute.

*[class~="topic/title"] {
  color:navy;
} 

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By default, the chapter/section number is on the same line as the title text. If the title is too long, the text wraps to the next line without any indentation.

4.5.5 This is a long title
text that wraps.

If you want the wrapped text to include indentation, you need to set the value of the args.css.param.title.layout transformation parameter to table. This results in the chapter/section number being placed in one cell while the rest of the title content is in another cell with wrapped text and it is displayed with an indent:

4.5.5 This is a long title
      text that wraps.