body{
    background-image: url('background.jpg') ;
        background-position: center;
        background-repeat: no-repeat;
        background-size: cover;
        -webkit-background-size: cover;
        -moz-background-size: cover;
        -o-background-size: cover;
        height:100%;
}

.dark-bckg {
    background-color: #2b2b2b;
    opacity: 0.9;
    color: white;
}