body {
    font-family: Arial, sans-serif;
}
button {
    margin: 5px 2px;
    padding: 6px 16px;
    font-size: 16px;
}
#resultado {
    margin-top: 20px;
    width: 100%;
    height: 250px;
    background-color: #b3e0f7;
    border: 3px solid #000;
    padding: 20px;
    font-size: 1.4em;
    font-weight: bold;
}