.bgstretcher {
    overflow: hidden;
    width: 100%;
    position: fixed !important;
    z-index: -1;
}
.bgstretcher, .bgstretcher ul, .bgstretcher ul li {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
}
.bgstretcher ul, .bgstretcher ul li {
    margin: 0;
    padding: 0;
    list-style: none;
}