h1,h2,h3,h4,h5,h6,p{margin:0}body{margin:0;font-family:Arial,Helvetica,sans-serif}button{font-size:1em;padding:5px 10px;border:none;border-radius:5px;background-color:#007bff;color:#fff;cursor:pointer}button:disabled{background-color:#ccc;color:#666;cursor:not-allowed}button:not(:disabled):hover{background-color:#0056b3}