:root{--background-color: #ffffff;--text-color: #000000}body{background-color:var(--background-color);color:var(--text-color);margin:0;font-family:Arial,sans-serif}*{border:0;margin:0;padding:0;box-sizing:border-box;font-family:Roboto,sans-serif}button{background-color:transparent}button:hover{opacity:.8}