_image.scss in jekyll-theme-twenty-0.1.16

- old
+ new

@@ -2,11 +2,14 @@
 
 .image {
     border: 0;
     position: relative;
 
-    &:before {
+    &.overlay:before {
         background: url('images/overlay.png');
+    }
+
+    &:before {
         content: '';
         height: 100%;
         left: 0;
         position: absolute;
         top: 0;
\ No newline at end of file