search button php

Can someone tell me how to edit this to just change the button style?

at the minute its a large search button that changes size to small when hovering im trying to find out what part of the php makes it do this?

cause its causing trouble on my website, when hovering the button is jerking big to small and llooks terrible…
heres the code

<input class=”dsp_submit_button” type=”submit” name=”submit” value=”<?=language_code(‘DSP_SEARCH_BUTTON’);?>” />