diff --git a/after/syntax/css/css-align-3.vim b/after/syntax/css/css-align-3.vim
index 4cfbf5f..bad0fa5 100644
--- a/after/syntax/css/css-align-3.vim
+++ b/after/syntax/css/css-align-3.vim
@@ -1,5 +1,5 @@
 " TODO: create cssAlignProp group and cssAlignAttr group
 syn match cssFontProp contained "\<\(justify\|align\)-\(self\|content\|items\)\>"
-syn keyword cssFontAttr contained safe true
+syn keyword cssFontAttr contained safe unsafe
 syn match cssFontAttr contained "\<\(self\|flex\)-\(start\|end\)\>"
 syn match cssFontAttr contained "\<space-\(between\|around\|evenly\)\>"
diff --git a/test/test.css b/test/test.css
index 875d8b6..81694c2 100644
--- a/test/test.css
+++ b/test/test.css
@@ -1,6 +1,6 @@
 .align {
   justify-self: safe;
-  justify-content: true;
+  justify-content: unsafe;
   justify-items: self-start;
   align-self: self-end;
   align-content: flex-start;
diff --git a/test/test.html b/test/test.html
index 6054de7..4d775b3 100644
--- a/test/test.html
+++ b/test/test.html
@@ -10,7 +10,7 @@
 <style>
 .align {
   justify-self: safe;
-  justify-content: true;
+  justify-content: unsafe;
   justify-items: self-start;
   align-self: self-end;
   align-content: flex-start;