When using Doxygen for C++ sources a size of font for \subsubsection is larger than for \section and \subsection

I installed Doxygen 1.6.1.

I used \section, \subsection and \subsubsection for titles in C++ sources.

I surprisingly obtained titles in which \subsubsection have large font size than for \subsection and \section.

How can this be fixed? CSS should be used to workaround this or can I fix my doxygen installation to obtain ex开发者_如何转开发pected common behavior?

Doxygen does not specify size of font in css template for \subsubsection, style for h4-tag should be specified. CSS should be overridden.