Use your own CSS 

ke_search comes with a default css file which is loaded automatically.

If you do not wish to use that file, you have the following possibilities.

Unset via TypoScript 

If you do not wish to load that file, you can unset it via TypoScript:

plugin.tx_kesearch_pi1.cssFile >
plugin.tx_kesearch_pi2.cssFile >
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Use plugin configuration 

You can also make use of the field in the plugin configuration. This overwrites the default CSS file.

Configure CSS file in plugin