body {
    height: 100%;
    text-align: center;
    background-position: center center;
    background-size: cover;
}

.contenido {
    display: flex;
    width: 100%;
    max-width: 330px;
    min-height: 100vh;
    align-items: center;
    justify-content: center;
    margin: auto;
}

form {
    background-color: rgba(255, 255, 255, 0.75);
    border-radius: 12px;
    padding: 16px;
}

form input {
    margin-bottom: 8px;
}