:root{--primary-color:#4285f4;--text-color:#333;--background-color:#f9f9f9}*{box-sizing:border-box}body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;background-color:var(--background-color);color:var(--text-color)}button{cursor:pointer;padding:10px 20px;background-color:var(--primary-color);color:#fff;border:none;border-radius:4px;font-size:16px}button:hover{opacity:.9}