How to overlay image with color in CSS?

You should use rgba for overlaying your element with photos.rgba is a way to declare a color in CSS that includes alpha transparency support. you can use .row as an overlayer like this:

#header {
    background: url(../img/bg.jpg) 0 0 no-repeat fixed;
    height: 100%;
    overflow: hidden;
    color: #FFFFFF
 }

.row{
    background: rgba(39,62,84,0.82);
    overflow: hidden;
    height: 100%;
    z-index: 2;
}