Google has unveiled a new logo for its core search services.The change smoothes out some of the features in the letters that make up the well-known colourful logo spelling out its name. It said the change was needed because people were now reaching Google on lots of mobile devices rather than just desktop computers. The change comes after Google put its many divisions under an umbrella company called Alphabet. It said that the logo, and its many variations, would work better on the many different-sized screens through which people used or encountered Google and its services. As well as the full logo of the company's name, it also plans to use four dots in its signature blue, red, yellow and green colours and a single, multi-coloured capital "G" to represent it.