[feature] Allow colour override for links

Author: zombieFox

css/base.css

@@ -82,6 +82,8 @@
 --background-blur:0;
 --layout-width:calc(70vw-var(--layout-width-gutter));
 --layout-width-gutter:var(--gutter) *8;
+--menu-border-width:2px;
+--menu-border:var(--menu-border-width) solid rgb(var(--gray-02));
 /* breakpoint reference */
 /* can not be used in @media as of yet */
 --breakpoint-sm:550px;