.carousel img {
  min-width: 100%;
  max-height:400px;
}
.carousel-control {
    font-size: 100px;
    top: 35%;
}

/* tablet portrait */
@media screen and (min-width: 741px) and (max-width: 940px) {
.carousel-control {
    font-size: 100px;
    top: 15%;
}

}