Create a special banner

Non Profit organisation is looking for someone who specialises in banners to create an eye catching banner that visitors to websites can see and be compelled to click on it. The banner will be placed in the header of the site we are having developed, and users should be able to download it with ease and (copy & paste) it on to their website or social media page to spread our message. We are Non Profit organisation so expect this to be done at minimal cost. banner content available to those pre selected. needs completing within 2 to 3 days max.