.main_bottom_back
{
    position:absolute;
    left:0px;
    width: 100%;
    height: 200px;
    background-color: #2D3538;
    z-index:-100;
    top:1090px;
}

.main_bottom
{
    position: relative;
    height: 200px;
    width: 1250px;
    background-color: #2D3538;
    top: 50px;
}

.main_first_body
{
    height: 60px;
}

.main_body
{
    position:relative;
    width:1200px;
}