Close to what I would like, so I made a new variant for myself (the dark blue just didn't mesh nicely with my custom background image):

@import url("../main.css");

.content, .shadow {
background-image: none;
}
.content {
background-color: #000;
opacity: .6;
-webkit-box-shadow: 0 9px 9px rgba(0, 0, 0, 0.7);
}