Update theme style

Author: frankheat

themes/mytheme/layouts/partials/site-nav.html

@@ -21,7 +21,7 @@
                             <span class="icon-expand" id="{{ $s }}-icon">
                                 <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"
                                     viewBox="0 0 512 512"><!--!Font Awesome Free 6.7.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free Copyright 2025 Fonticons, Inc.-->
-                                    <path fill="#adb5db"
+                                    <path fill="#cfcfcf"
                                         d="M310.6 233.4c12.5 12.5 12.5 32.8 0 45.3l-192 192c-12.5 12.5-32.8 12.5-45.3 0s-12.5-32.8 0-45.3L242.7 256 73.4 86.6c-12.5-12.5-12.5-32.8 0-45.3s32.8-12.5 45.3 0l192 192z" />
                                 </svg>
                             </span>