.szeroki-pas-container {
    position: relative;
    padding:1px 0;
}
.szeroki-pas-content {
    position: relative;
    z-index:10;
}

.szeroki-pas-background {
    position: absolute;
        bottom:0;
        left:0;
        right:0;
        top:0;
    background:#eee;
}

html {

}