Add custom CSS property for content list gap

src/assets/css/content.css

@@ -31,11 +31,11 @@ content-wrapper,
 
 .content ul:not([class]), .content ol:not([class]) {
     display: grid;
-    gap: 0.7em;
+    gap: var(--sz-content-list-gap);
 }
 
 .content ul ul, .content ol ol,
-.content ul ol, .content ol ul { margin-top: 0.7em; }
+.content ul ol, .content ol ul { margin-top: var(--sz-content-list-gap); }
 
 .sidebar--sticky {
     position: sticky;

src/assets/css/global.css

@@ -48,6 +48,7 @@
     --sz-main-padding: clamp(1rem, 5%, 4rem);
     --sz-navbar-ht: 4rem;
     --sz-external-link: 1.25em;
+    --sz-content-list-gap: 0.7em;
 }
 
 /* ------------------- */