body {
    font-family: Arial, sans-serif;
    margin: 30px;
}

h2 {
    margin-bottom: 20px;
}

.input-section {
    margin-bottom: 30px;
    padding: 15px;
    border: 1px solid #999;
    width: 350px;
}

.input-section input {
    width: 80px;
    margin: 5px;
}

#resultado {
    margin-top: 10px;
    padding: 8px;
    background: #f3f3f3;
    min-height: 30px;
    border: 1px solid #aaa;
}

table {
    width: 60%;
    border-collapse: collapse;
}

table th, table td {
    border: 1px solid #444;
    padding: 8px;
}

button {
    padding: 5px 10px;
}