Board Thread:Support Requests - Getting Technical/@comment-35239236-20151222063254/@comment-4731443-20151222065827

Adding a rule for code tags in your wiki's Special:CSS should do the trick, I would expect.

code { font-family: monospace; background-color: #DEDEDE; padding: 3px; }

If some parameters are ignored and replaced by defaults, you may need to add  to them.