.carousel-control-prev,.carousel-control-next{
    background-color: #e1e1e1;
    width: 4vh;
    height: 7vh;
    border-radius: 50%;
    top :50%;
    transform: scaleY(-50%);
    opacity: .5;
}
.carousel-control-prev:hover,.carousel-control-next:hover{
     opacity: 1;
}
.carousel-control-prev span,.carousel-control-next span{
    width: 1rem;
}