To darken an element using CSS
.home-featured .featured-content .entry {
position: relative;
}
.home-featured .featured-content .entry:before {
content: "";
display: block;
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
pointer-events: none;
background: rgba(0,0,0,0.5);
}