Update runtime files
diff --git a/runtime/syntax/sass.vim b/runtime/syntax/sass.vim
index b51a0ae..8f41aba 100644
--- a/runtime/syntax/sass.vim
+++ b/runtime/syntax/sass.vim
@@ -2,7 +2,7 @@
" Language: Sass
" Maintainer: Tim Pope <vimNOSPAM@tpope.org>
" Filenames: *.sass
-" Last Change: 2019 Dec 05
+" Last Change: 2022 Mar 15
if exists("b:current_syntax")
finish
@@ -58,6 +58,7 @@
" TODO: Arithmetic (including strings and concatenation)
syn region sassMediaQuery matchgroup=sassMedia start="@media" end="[{};]\@=\|$" contains=sassMediaOperators
+syn region sassKeyframe matchgroup=cssAtKeyword start=/@\(-[a-z]\+-\)\=keyframes\>/ end=";\|$" contains=cssVendor,cssComment nextgroup=cssDefinition
syn keyword sassMediaOperators and not only contained
syn region sassCharset start="@charset" end=";\|$" contains=scssComment,cssStringQ,cssStringQQ,cssURL,cssUnicodeEscape,cssMediaType
syn region sassInclude start="@import" end=";\|$" contains=scssComment,cssStringQ,cssStringQQ,cssURL,cssUnicodeEscape,cssMediaType