Update vacancies.md

_pages/vacancies.md

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-<font size="6"> Postdoc Positions </font>
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+<font size="5"> Postdoc Positions </font>
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 I have 4 Postdocs opening in 3D Computer Vision, Robotics and Underwater SLAM. Please contact me with your publication list and latest CV.
 
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-<font size="6"> PhD Positions </font>
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+<font size="5"> PhD Positions </font>
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 I constantly recruit 2-3 PhD students every year. Please contact me if you are interested. 
 
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-<font size="6"> Visiting Positions </font>
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+<font size="5"> Visiting Positions </font>
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 We regularly accept exceptional visiting PhD students who have strong publication record in top venues about perception, robotics and computer vision. If you are interested in visiting us, please send us a description of your research and your publication list.