Change colour styles of buttons & calendar

-- url of the page with the problem -- : effectiveoffshore.ie/jun15/index.php/hik...1-day-opito-approved
-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.5
-- Browser(s) name and version -- : Firefox 40.0

Hi,

If you look at the attachment I would like to change the colour style of the buttons and the calendar, I paid for and installed the blue theme but it still looks strange and the colour of the text in the background does not suit it.

How can I change the colours of the button (rollover & static), change the colours used in the calendar and also move the calendar label to above the calendar instead of to the left of it?

Thanks,
Andrew