*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:#f5f5f5;color:#333;line-height:1.6}button{cursor:pointer}a{color:inherit;text-decoration:none}