body {
    font-family: Arial, sans-serif;
    background-color: #ffffff;
    margin: 0;
    padding: 0;
    color: black;
}

header {
    background-color: #000000;
    color: white;
    padding: 20px;
    text-align: center;
}

nav ul {
    list-style-type: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
}

nav ul li a:hover {
    text-decoration: underline;
}

main {
    display: flex;
    margin: 20px;
}

.contenedor {
    background-color: white;
    padding: 20px;
    margin: 30px auto;
    width: 500px;
    box-shadow: 0 0 10px gray;
    text-align: center;
}

form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

form label {
    display: flex;
    flex-direction: column;
    font-weight: bold;
    text-align: left;
}

form input,
form textarea,
form select {
    border: 1px solid black;
    padding: 8px;
    width: 100%;
    box-sizing: border-box;
}

.contenedor img {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
    margin-bottom: 20px;
}

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

th, td {
    border: 1px solid #888;
    padding: 10px;
    text-align: left;
}

a.boton {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 20px;
    border: 2px solid black;
    background-color: white;
    color: black;
    text-decoration: none;
    font-weight: bold;
    border-radius: 5px;
}

a.boton:hover {
    background-color: #f5f5f5;
}

footer {
    background-color: #000000;
    color: white;
    text-align: center;
    padding: 10px;
    position: relative;
    bottom: 0;
    width: 100%;
}