body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 30px auto;
    padding: 0 15px;
}

input {
    width: 100%;
    padding: 12px;
    font-size: 16px;
}

.resultado {
    margin-top: 15px;
    padding: 10px;
    border-left: 4px solid #ddd;
}