body {
    background-color: #123248;
    margin: 0;
    height: 100%;

}

.caja {
    /* display:flex;
    justify-content: center;
    align-items: center; */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.caja picture img{
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    max-width: 90%;
}


/* Footer */
.footer {
    text-align: center;
    position: fixed;
    bottom: 15px;
    width: 100%;
    text-align: center;

}


.footer a {
    text-decoration: none;
    color: #fdfcfc;
    font-size: 16px;
}

.footer a:hover {
    text-decoration: underline;
}