Update _keys.scss

Change to the keys 

    "arrow-down": "\2193", // ↓
    "arrow-left": "\2190", // ←
    "arrow-right": "\2192", // →
    "arrow-up": "\2191", // ↑
    "tab": "\21E5", // ⇥

also makes a few other lowercase hex numerals uppercase for consistency

src/assets/stylesheets/main/extensions/pymdownx/_keys.scss

@@ -19,91 +19,98 @@
 /// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 /// DEALINGS
 ////
+
 // ----------------------------------------------------------------------------
 // Rules
 // ----------------------------------------------------------------------------
-// Scoped in typeset content to match specificity of regular content
+
+// Scoped in typesetted content to match specificity of regular content
 .md-typeset .keys {
-    // Keyboard key icon
+
-    kbd::before,
+  // Keyboard key icon
-    kbd::after {
+  kbd::before,
-        position: relative;
+  kbd::after {
-        margin: 0;
+    position: relative;
-        color: inherit;
+    margin: 0;
-        -moz-osx-font-smoothing: initial;
+    color: inherit;
-        -webkit-font-smoothing: initial;
+    -moz-osx-font-smoothing: initial;
-    }
+    -webkit-font-smoothing: initial;
-    // Surrounding text
+  }
-    span {
+
-        padding: 0 px2em(3.2px);
+  // Surrounding text
-        color: var(--md-default-fg-color--light);
+  span {
-    }
+    padding: 0 px2em(3.2px);
-    // Build special keys with icon on the left
+    color: var(--md-default-fg-color--light);
-    @each $name,
+  }
-    $code in ( // Modifiers
+
-    "alt": "\2387", // ⎇
+  // Build special keys with left icon
-    "left-alt": "\2387", // ⎇
+  @each $name, $code in (
-    "right-alt": "\2387", // ⎇
+
-    "command": "\2318", // ⌘
+    // Modifiers
-    "left-command": "\2318", // ⌘
+    "alt":           "\2387",
-    "right-command": "\2318", // ⌘
+    "left-alt":      "\2387",
-    "control": "\2303", // ⌃
+    "right-alt":     "\2387",
-    "left-control": "\2303", // ⌃
+    "command":       "\2318",
-    "right-control": "\2303", // ⌃
+    "left-command":  "\2318",
-    "meta": "\25C6", // ◆
+    "right-command": "\2318",
-    "left-meta": "\25C6", // ◆
+    "control":       "\2303",
-    "right-meta": "\25C6", // ◆
+    "left-control":  "\2303",
-    "option": "\2325", // ⌥
+    "right-control": "\2303",
-    "left-option": "\2325", // ⌥
+    "meta":          "\25C6",
-    "right-option": "\2325", // ⌥
+    "left-meta":     "\25C6",
-    "shift": "\21E7", // ⇧
+    "right-meta":    "\25C6",
-    "left-shift": "\21E7", // ⇧
+    "option":        "\2325",
-    "right-shift": "\21E7", // ⇧
+    "left-option":   "\2325",
-    "super": "\2756", // ❖
+    "right-option":  "\2325",
-    "left-super": "\2756", // ❖
+    "shift":         "\21E7",
-    "right-super": "\2756", // ❖
+    "left-shift":    "\21E7",
-    "windows": "\229E", // ⊞
+    "right-shift":   "\21E7",
-    "left-windows": "\229E", // ⊞
+    "super":         "\2756",
-    "right-windows": "\229E", // ⊞
+    "left-super":    "\2756",
+    "right-super":   "\2756",
+    "windows":       "\229E",
+    "left-windows":  "\229E",
+    "right-windows": "\229E",
+
     // Other keys
-    "arrow-down": "\2193", // ↓
+    "arrow-down":    "\2193",
-    "arrow-left": "\2190", // ←
+    "arrow-left":    "\2190",
-    "arrow-right": "\2192", // →
+    "arrow-right":   "\2192",
-    "arrow-up": "\2191", // ↑
+    "arrow-up":      "\2191",
-    "backspace": "\232B", // ⌫
+    "backspace":     "\232B",
-    "backtab": "\21E4", // ⇤
+    "backtab":       "\21E4",
-    "caps-lock": "\21EA", // ⇪
+    "caps-lock":     "\21EA",
-    "clear": "\2327", // ⌧
+    "clear":         "\2327",
-    "context-menu": "\2630", // ☰
+    "context-menu":  "\2630",
-    "delete": "\2326", // ⌦
+    "delete":        "\2326",
-    "eject": "\23CF", // ⏏
+    "eject":         "\23CF",
-    "end": "\2913", // ⤓
+    "end":           "\2913",
-    "escape": "\238B", // ⎋
+    "escape":        "\238B",
-    "home": "\2912", // ⤒
+    "home":          "\2912",
-    "insert": "\2380", // ⎀
+    "insert":        "\2380",
-    "page-down": "\21DF", // ⇟
+    "page-down":     "\21DF",
-    "page-up": "\21DE", // ⇞
+    "page-up":       "\21DE",
-    "print-screen": "\2399" // ⎙
+    "print-screen":  "\2399"
-    ) {
+  ) {
-        .key-#{$name} {
+    .key-#{$name} {
-            &::before {
+      &::before {
-                padding-right: px2em(6.4px);
+        padding-right: px2em(6.4px);
-                content: $code;
+        content: $code;
-            }
+      }
-        }
     }
-    // Build special keys with icon on the right
+  }
-    @each $name,
+
-    $code in ( // Keys
+  // Build special keys with right icon
-    "tab": "\21E5", // ⇥
+  @each $name, $code in (
-    "num-enter": "\2324", // ⌤
+    "tab":           "\21E5",
-    "enter": "\23CE" // ⏎
+    "num-enter":     "\2324",
-    ) {
+    "enter":         "\23CE"
-        .key-#{$name} {
+  ) {
-            &::after {
+    .key-#{$name} {
-                padding-left: px2em(6.4px);
+      &::after {
-                content: $code;
+        padding-left: px2em(6.4px);
-            }
+        content: $code;
-        }
+      }
     }
-}
+  }
+}