change search icon on touch(mobile)

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i try search how could i change icon of search on click i want it became a X and not keep the same icon of search and i want it come back as an search icon when click on X:Capture d’écran 2019-10-25 à 21.08.46.png

my site is : and why does the when i click on the top logo it does an research?:Capture d’écran 2019-10-25 à 21.11.17.png it should be only the down icon searching and not the upper icon


All the best,