.central {
    text-align: center;
}
.bg-grey{
    background-color:#111111;
}
.txt-white{
    color: white;
}
.header{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color:#111111 ;
    padding: 15px 0;
    text-align: center;
    z-index: 1000;
}
body{
    padding-top: 200px;
}