Added missing code block css

theme/github-dark.css

@@ -1,4 +1,4 @@
-@import './notes-dark/codeblock.xydark.css';
+@import './github-dark/codeblock.xydark.css';
 
 :root {
   --primary-color: #025bc8;

theme/github-dark/codeblock.xydark.css

@@ -0,0 +1,107 @@
+@charset "UTF-8";
+
+.cm-s-inner .cm-variable {
+  color: #fff;
+}
+
+.cm-s-inner .cm-keyword,
+.cm-s-inner .cm-property {
+  color: #6699CC;
+}
+
+.cm-s-inner .cm-tag {
+  color: #EC5F67;
+}
+
+.CodeMirror div.CodeMirror-cursor {
+  border-left: 1px solid #b8bfc6;
+  z-index: 3;
+}
+
+.cm-s-inner .cm-string {
+  color: #99C794;
+}
+
+.cm-s-inner .cm-comment,
+.cm-s-inner.cm-comment {
+  color: #65737E;
+}
+
+.cm-s-inner .cm-header,
+.cm-s-inner .cm-def,
+.cm-s-inner.cm-header,
+.cm-s-inner.cm-def,
+.cm-s-inner .cm-attribute,
+.cm-s-inner .cm-operator {
+  color: #C594C5;
+}
+
+.cm-s-inner .cm-quote,
+.cm-s-inner.cm-quote {
+  color: #99C794;
+}
+
+.cm-s-inner .cm-hr {
+  color: #d8d5d5;
+}
+
+.cm-s-inner .cm-link {
+  color: #d3d3ef;
+}
+
+.cm-s-inner .cm-negative {
+  color: #EC5F67;
+}
+
+.cm-s-inner .cm-positive {
+  color: #99C794;
+}
+
+.cm-s-inner .cm-string-2 {
+  color: #EC5F67;
+}
+
+.cm-s-inner .cm-meta,
+.cm-s-inner .cm-qualifier {
+  color: #b7b3b3;
+}
+
+.cm-s-inner .cm-builtin {
+  color: #f3b3f8;
+}
+
+.cm-s-inner .cm-bracket {
+  color: #5FB3B3;
+}
+
+.cm-s-inner .cm-atom,
+.cm-s-inner.cm-atom {
+  color: #84B6CB;
+}
+
+.cm-s-inner .cm-number {
+  color: #F99157;
+}
+
+.cm-s-inner .cm-variable {
+  color: #b8bfc6;
+}
+
+.cm-s-inner .cm-variable-2 {
+  color: #9FBAD5;
+}
+
+.cm-s-inner .cm-variable-3 {
+  color: #1cc685;
+}
+
+.CodeMirror-selectedtext,
+.CodeMirror-selected {
+  background: #4a89dc;
+  color: #fff !important;
+  text-shadow: none;
+}
+
+.CodeMirror-gutters {
+  border-right: none;
+}