PHP Bootstrap problem ( white row )

hello all, i am creating web page for school project and when I created switch, some white rows appears on web page:
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index.php
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Can you help me how to delete those white rows? thanks :)

Hi,

could you also post the definition of theclass "kontajner" as well as the content of the "header.html" file?

If you fail to figure out the problem with your markup, one possibility to solve the problem yourself could be to start again with the source code of one of bootstrap's [Only registered and activated users can see links. Click Here To Register...] and extend it with your modifications step by step. If you take a look at the result after every change to the source code, you can see which step or modification causes the problem.

#kontajner {
min-height: 100%;
position: relative;
}

I know but this problem started when I include switch. Without switch its okay and when I include switch, this row appears.