diff --git a/themes/github.css b/themes/github.css
index d2a5642..34db05d 100644
--- a/themes/github.css
+++ b/themes/github.css
@@ -1,6 +1,9 @@
 :root {
     --side-bar-bg-color: #fafafa;
     --control-text-color: #777;
+    --focus-offset: -1.5625rem;
+    --focus-top: .285714286rem;
+    --unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD, U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
 }
 
 @include-when-export url(https://fonts.loli.net/css?family=Open+Sans:400italic,700italic,700,400&subset=latin,latin-ext);
@@ -11,7 +14,7 @@
     font-style: normal;
     font-weight: normal;
     src: local('Open Sans Regular'), local('OpenSans-Regular'), url('./github/open-sans-v17-latin-ext_latin-regular.woff2') format('woff2');
-    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD, U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
+    unicode-range: var(--unicode-range);
   }
   /* open-sans-italic - latin-ext_latin */
   @font-face {
@@ -19,7 +22,7 @@
     font-style: italic;
     font-weight: normal;
     src: local('Open Sans Italic'), local('OpenSans-Italic'), url('./github/open-sans-v17-latin-ext_latin-italic.woff2') format('woff2');
-    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD, U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
+    unicode-range: var(--unicode-range);
   }
   /* open-sans-700 - latin-ext_latin */
   @font-face {
@@ -27,7 +30,7 @@
     font-style: normal;
     font-weight: bold;
     src: local('Open Sans Bold'), local('OpenSans-Bold'), url('./github/open-sans-v17-latin-ext_latin-700.woff2') format('woff2'); 
-    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD, U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
+    unicode-range: var(--unicode-range);
   }
   /* open-sans-700italic - latin-ext_latin */
   @font-face {
@@ -35,7 +38,7 @@
     font-style: italic;
     font-weight: bold;
     src: local('Open Sans Bold Italic'), local('OpenSans-BoldItalic'), url('./github/open-sans-v17-latin-ext_latin-700italic.woff2') format('woff2');
-    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD, U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
+    unicode-range: var(--unicode-range);
   }
 
 html {
@@ -190,7 +193,7 @@ li p.first {
 }
 ul,
 ol {
-    padding-left: 30px;
+    padding-inline-start: 30px;
 }
 ul:first-child,
 ol:first-child {
@@ -201,12 +204,12 @@ ol:last-child {
     margin-bottom: 0;
 }
 blockquote {
-    border-left: 4px solid #dfe2e5;
+    border-inline-start: 4px solid #dfe2e5;
     padding: 0 15px;
     color: #777777;
 }
 blockquote blockquote {
-    padding-right: 0;
+    padding-inline-end: 0;
 }
 table {
     padding: 0;
@@ -243,7 +246,7 @@ table td:last-child {
 }
 
 .CodeMirror-lines {
-    padding-left: 4px;
+    padding-inline-start: 4px;
 }
 
 .code-tooltip {
@@ -276,7 +279,7 @@ code {
 
 
 .md-task-list-item > input {
-  margin-left: -1.3em;
+    margin-inline-start: -1.3em;
 }
 
 @media print {
@@ -312,20 +315,20 @@ code {
 }
 
 #write>h3.md-focus:before{
-	left: -1.5625rem;
+    inset-inline-start: var(--focus-offset);
 	top: .375rem;
 }
 #write>h4.md-focus:before{
-	left: -1.5625rem;
-	top: .285714286rem;
+    inset-inline-start: var(--focus-offset);
+    top: var(--focus-top);
 }
 #write>h5.md-focus:before{
-	left: -1.5625rem;
-	top: .285714286rem;
+    inset-inline-start: var(--focus-offset);
+    top: var(--focus-top);
 }
 #write>h6.md-focus:before{
-	left: -1.5625rem;
-	top: .285714286rem;
+    inset-inline-start: var(--focus-offset);
+    top: var(--focus-top);
 }
 .md-image>.md-meta {
     /*border: 1px solid #ddd;*/
@@ -363,7 +366,7 @@ code {
 
 /** focus mode */
 .on-focus-mode blockquote {
-    border-left-color: rgba(85, 85, 85, 0.12);
+    border-inline-start-color: rgba(85, 85, 85, 0.12);
 }
 
 header, .context-menu, .megamenu-content, footer{