:root
{
    background: #393d42;
}
.navbar{
    background:black;
}

.title{
    color: white;
}

.imagen {
    display: none;
}

@media (min-width: 768px) {
    .img-grande {
        display: block;
        max-width: 100%;
        height: auto; 
    }
}

@media (max-width: 767px) {
    .img-little {
        display: block;
        max-width: 100%;
        height: auto; 
    }
}