diff --git a/boards/static/css/base.css b/boards/static/css/base.css
--- a/boards/static/css/base.css
+++ b/boards/static/css/base.css
@@ -153,6 +153,7 @@ textarea, input {
     opacity: 1;
 }
 
-.monochrome {
+.monochrome > .image > .thumb > img {
     filter: grayscale(100%);
-}
\ No newline at end of file
+    -webkit-filter: grayscale(100%);
+}