[update] tweak inline code styling

- border-radius 2px -> 5px (rounder corners)
- vertical padding 6px -> 2px (slimmer inline code)

Author: serhiipylypchuk1991

src/css/custom.css

@@ -163,9 +163,9 @@ table th:first-child {
 /* small code block */
 
 code {
-    border-radius: 2px;
-    padding: 6px 8px;
-    font-weight: 600;
+  border-radius: 5px;
+  padding: 2px 8px;
+  font-weight: 600;
 }
 
 /* end small code block */