[DESIGN] restyling <code>

extensions/odoo_theme/static/style.scss

@@ -459,6 +459,14 @@ header.o_main_header{
                 }
             }
 
+            code {
+                display: inline-block;
+                background: $doc_code-bg;
+                padding: 0 .3rem;
+                margin: 0.1rem;
+                border: 1px solid $gray-light;
+            }
+
             dt {
                 &:before {
                     @include scroll-padding()