.bgimg {
    background-position: center;
    background-size: cover;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
}
.bgimg-light {
    background-image: url("/images/welcome.jpg");
}
.bgimg-dark {
    background-image: url("/images/welcome-dark.jpg");
}