.carousel-item {
    height: 400px;
}

.imagem{
    height: 100%;
}   

.carousel{
    margin-left: 100px;
    margin-right: 100px;
}
@media(max-width:770px){
    .carousel-item{
        .carousel-item{
            height: 300px;
        }
    }
}

@media (max-width:440px){
    .carousel-item{
        height: 200px;
    }
    .carousel-item{
        margin: 0;
    }
    *{
        margin: 0 !important; 
    }
    p{
        text-align: center;
    }
}