html,body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;overflow:hidden}.simple-keyboard.hg-layout-default .hg-button.hg-exist{color:#000;background-color:#ef0}.simple-keyboard.hg-layout-default .hg-button.hg-wrong{color:#fff;background-color:gray}