fix(ui): inline code style

Fix #6121

resources/css/common.css

@@ -1085,6 +1085,8 @@ mark {
   font-family: MonoLisa, 'Fira Code', Monaco, Menlo, Consolas, 'COURIER NEW',
     monospace;
   letter-spacing: 0;
+  background-color: var(--ls-page-inline-code-bg-color, #eee);
+  color: var(--ls-page-inline-code-color);
   word-spacing: -0.15em;
   text-rendering: optimizeSpeed;
 }