diff --git a/boards/mdx_neboard.py b/boards/mdx_neboard.py
--- a/boards/mdx_neboard.py
+++ b/boards/mdx_neboard.py
@@ -169,10 +169,10 @@ def render_tag(tag_name, value, options,
 
 def render_spoiler(tag_name, value, options, parent, context):
     text_len = len(value)
-    pre_spaces = ' ' * max(random.randint(0, text_len // 2), 2)
-    post_spaces = ' ' * max(random.randint(0, text_len // 2), 2)
-    return '<span class="spoiler">{}{}{}</span>'.format(pre_spaces, value,
-            post_spaces)
+    space_count = random.randint(0, text_len * 2)
+    side_spaces = '&nbsp;' * (space_count // 2)
+    return '<span class="spoiler">{}{}{}</span>'.format(side_spaces, value,
+            side_spaces)
 
     return quote_element