Restoring .black-shadow to sessions blocks in catalog - refs BT#12646

app/Resources/public/css/base.css

@@ -4826,6 +4826,23 @@ div#chat-remote-video video {
     height: 42px;
     margin: 0;
 }
+.grid-courses .items .image .black-shadow {
+    top: 0px;
+    left: 0px;
+    width: 100%;
+    height: 100%;
+    opacity: 0;
+    box-sizing: border-box;
+    position: absolute;
+    background: rgba(0, 0, 0, 0.7) none repeat scroll 0% 0%;
+    padding: 40px 10px 10px;
+}
+
+.grid-courses .items .image .hovered-course {
+    opacity: 1;
+    transition: all 0.3s ease 0s;
+}
+
 .hot-courses .grid-courses .items .title{
     line-height: 1.4;
     padding: 0px;