:root{--timing-function:cubic-bezier(0.4,0,0.2,1)}*,:after,:before{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;transition:color .15s var(--timing-function),background-color .15s var(--timing-function);background-color:grey;color:#000}