Make overlay less opaque

Author: zuck

assets/css/main.css

@@ -99,7 +99,7 @@ figure > figcaption {
   box-sizing: border-box;
   flex: 1;
   padding: 1rem 0 3rem;
-  background-color: rgba(0,0,0,.8);
+  background-color: rgba(0,0,0,.7);
   color: rgba(255,255,255,.8);
 }