diff --git a/blog/src/main/asciidoc/COPYING.grayscalecss.txt b/blog/src/main/asciidoc/COPYING.grayscalecss.txt
new file mode 100644
index 0000000..c292862
--- /dev/null
+++ b/blog/src/main/asciidoc/COPYING.grayscalecss.txt
@@ -0,0 +1,32 @@
+The grayscale.css file contained in this directory is part of the
+highlight.js project and distributed under the following license:
+
+BSD 3-Clause License
+
+Copyright (c) 2006, Ivan Sagalaev.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/blog/src/main/asciidoc/grayscale.css b/blog/src/main/asciidoc/grayscale.css
new file mode 100644
index 0000000..c1d8b5e
--- /dev/null
+++ b/blog/src/main/asciidoc/grayscale.css
@@ -0,0 +1 @@
+.hljs{display:block;overflow-x:auto;padding:.5em;color:#333;background:#fff}.hljs-comment,.hljs-quote{color:#777;font-style:italic}.hljs-keyword,.hljs-selector-tag,.hljs-subst{color:#333;font-weight:700}.hljs-literal,.hljs-number{color:#777}.hljs-doctag,.hljs-formula,.hljs-string{color:#333;background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAYAAACp8Z5+AAAAJ0lEQVQIW2O8e/fufwYGBgZBQUEQxcCIIfDu3Tuwivfv30NUoAsAALHpFMMLqZlPAAAAAElFTkSuQmCC) repeat}.hljs-section,.hljs-selector-id,.hljs-title{color:#000;font-weight:700}.hljs-subst{font-weight:400}.hljs-class .hljs-title,.hljs-name,.hljs-type{color:#333;font-weight:700}.hljs-tag{color:#333}.hljs-regexp{color:#333;background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAICAYAAADA+m62AAAAPUlEQVQYV2NkQAN37979r6yszIgujiIAU4RNMVwhuiQ6H6wQl3XI4oy4FMHcCJPHcDS6J2A2EqUQpJhohQDexSef15DBCwAAAABJRU5ErkJggg==) repeat}.hljs-bullet,.hljs-link,.hljs-symbol{color:#000;background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAKElEQVQIW2NkQAO7d+/+z4gsBhJwdXVlhAvCBECKwIIwAbhKZBUwBQA6hBpm5efZsgAAAABJRU5ErkJggg==) repeat}.hljs-built_in,.hljs-builtin-name{color:#000;text-decoration:underline}.hljs-meta{color:#999;font-weight:700}.hljs-deletion{color:#fff;background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAADCAYAAABS3WWCAAAAE0lEQVQIW2MMDQ39zzhz5kwIAQAyxweWgUHd1AAAAABJRU5ErkJggg==) repeat}.hljs-addition{color:#000;background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAJCAYAAADgkQYQAAAALUlEQVQYV2N89+7dfwYk8P79ewZBQUFkIQZGOiu6e/cuiptQHAPl0NtNxAQBAM97Oejj3Dg7AAAAAElFTkSuQmCC) repeat}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}
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