This can be done using the V1 code:

  • You are going to https://www.google.com/cse/
  • You click on the title of your existing search engine
  • You choose "Get code"
  • At the bottom of the page, click 'Get the V1 code'


The V1 code gives you access to all styles, and you can customize the customization of the Google Custom Search through CSS.