.carousel {

    margin-right: auto;
    margin-left: auto;
    width: 300px ;
}

.carousel-control-prev-icon,
.carousel-control-next-icon {
    background-color: rgba(0, 0, 0, 0.9);
    border-radius: 50%;
}



@media (max-width: 550px) {
    .carousel {
        width: 100%;
    }
}