.banner__nubes{
    display: flex;
    justify-content: center;
}
.banner__nubes img{
    margin: 4rem auto;
    width: 40%;
}
@media (min-width:768px){
    .banner__nubes{
        width: 100%;
        z-index: 1;
        display: flex;
        justify-content: center;
    }
    .banner__nubes img{
        margin: 10rem auto !important;
        width: 40%;
    }
}