Press left and right arrow keys. Or space. Or click.
Update 9/05/2019 - Re-sized the costume editor bitmap images only to realize 3.0 compressed them to death. Hope you like JPEGs. Update 3/02/2019 - The costume editor feedback is absolutely broken due to 3.0 scaling bitmap graphics wrong. Update 30/11/2018 - Added feedback on the vector editor and block colours I'm also posting some feedback on the Scratch 3.0 Github: https://github.com/LLK/scratch-gui/issues
