body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0; /* Color de fondo opcional */
    font-family: Arial, sans-serif;
}

.centered {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    text-align: center;
}

.container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background-color: #ffffff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

table {
    width: 100%;
    margin: 20px 0;
    border-collapse: collapse;
}

td {
    padding: 10px;
}

input[type="text"] {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    box-sizing: border-box;
    text-align: center;
}

input[type="submit"], .btn {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    box-sizing: border-box;
    background-color: #007BFF;
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 16px;
    text-transform: uppercase;
}

input[type="submit"]:hover, .btn:hover {
    background-color: #0056b3;
}

h1 {
    margin-bottom: 20px;
}

strong {
    display: block;
    margin-bottom: 10px;
}

.results {
    margin-top: 20px;
}

.certificado {
    border: 1px solid #ddd;
    padding: 20px;
    margin-top: 10px;
    background-color: #f9f9f9;
}

.certificado table {
    width: 100%;
}

.certificado td {
    padding: 5px;
}

.nos_2a1 {
    margin-top: 10px;
}

a {
    color: #007BFF;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}