.fadein {
    position: relative;
    height: 350px;
    width: 100%;
    overflow: hidden;
}
@media ( max-width: 766px) {
    .fadein {
        position: relative;
        height: 150px;
        width: 100%;
        overflow: hidden;
    }

}

.fadein img {
    position:absolute;
    left: 0;
    top: 0;
    width: 100%;
}