@media screen and (min-width:991px){
    .top_bar_big {visibility: visible;display:block;}
    .nav_bar {visibility: visible;display:block;}
    .top_bar_small {visibility: hidden; display:none;}
    #header {margin-bottom: -35px;}
    .footerWrap{max-width:1100px;}
}

@media screen and (max-width:990px){
    .top_bar_big {visibility: hidden; display:none;}
    .nav_bar {visibility: hidden;  display:none;}
    .top_bar_small {visibility: visible;display:block;}
    #header {margin-bottom: 0;}
    .footerWrap{width:100%;}
}