You can achieve that quite easy by:
1/ tweaking yourself a bit the CSS code for the header
> if you have the experience and know your way.
>> clean and light way to tweak something.
2/ otherwise I think this plugin can do the job if you're not familiar to dive into the code:
>> also clean way, but take care to not overload your wp-installation with too much plugins to get too much things tweaked. :-)
>> also, by using plugins, take into account they don't break down, when you do a wordpress core update in the future.
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