diff --git a/common/static/sass/_MdContent.sass b/common/static/sass/_MdContent.sass
index 7b38b2ef..ebfa1c45 100644
--- a/common/static/sass/_MdContent.sass
+++ b/common/static/sass/_MdContent.sass
@@ -63,3 +63,11 @@
     & mark
         background: unset;
         text-decoration: underline;
+
+    & .spoiler
+        filter: blur(8px);
+        cursor: pointer;
+
+    & .spoiler .revealed
+        filter: unset;
+        color: inherit;