body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f4f6f8;
}

header {
    background: #1565c0;
    color: white;
    padding: 20px;
    text-align: center;
}

.contenedor-login {
    width: 400px;
    margin: 100px auto;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 10px;

    box-shadow:
            0 2px 10px rgba(0,0,0,0.15);
}

input,
select {

    width: 100%;

    padding: 10px;

    margin-top: 5px;

    margin-bottom: 15px;

    box-sizing: border-box;
}

button {

    background: #1565c0;

    color: white;

    border: none;

    padding: 10px 20px;

    border-radius: 5px;

    cursor: pointer;
}

button:hover {

    background: #0d47a1;
}

.menu {

    background: #263238;

    padding: 15px;

    text-align: center;
}

.menu a {

    color: white;

    margin: 0 15px;

    text-decoration: none;
}

.menu a:hover {

    text-decoration: underline;
}

.contenido {

    padding: 30px;
}

table {

    width: 100%;

    border-collapse: collapse;

    background: white;
}

th,
td {

    padding: 10px;

    border: 1px solid #ddd;

    text-align: left;
}

th {

    background: #1565c0;

    color: white;
}

.mensaje-error {
    color: red;
}