Changed structure to keep code contained to file_upload.jsx

web/sass-files/sass/partials/_files.scss

@@ -202,3 +202,15 @@
     }
   }
 }
+
+.center-file-overlay {
+  width: 100%;
+  height: 100%;
+  background:rgba(255,255,255,0.5);
+}
+
+.right-file-overlay {
+  width: 100%;
+  height: 100%;
+  background:rgba(255,255,255,0.5);
+}

web/sass-files/sass/partials/_post_right.scss

@@ -1,11 +1,5 @@
 .post-right__container {
 
-	.post-right-file-overlay {
-		width: 100%;
-		height: 100%;
-		background:rgba(255,255,255,0.5);
-	}
-
 	.post-right-root-message {
 		padding: 1em 1em 0;
 	}