@media only screen and (max-width: 768px) and (min-width: 320px)  {
.caption {
    position: absolute;
    top: 40px;
    right: 0;
    margin: 0 auto;
    left: 0;
    width: 90%;
    z-index: 1;
}   
.main-slider .item {
    min-height: auto;
}
}