.unidades h2{
    animation: typing 1.5s steps(20) infinite alternate-reverse;
}
@keyframes typing{
    from {
        width: 0ch;
    }
}
/* .fortalezas h2{
    animation:slide-right 0.9s linear reverse
}@keyframes slide-right{
    0%{transform:translateX(0)}
    100%{transform:translateX(400px)}
} */

.bloque:hover{
    animation:shadow-inset-center 0.4s linear both
}
 @keyframes shadow-inset-center{
    0%{box-shadow:inset 0 0 0 0 transparent}
    100%{box-shadow:inset 0 0 14px 2px rgba(0,0,0,1)}
}