Issue: EnlighterJS codeblocks are floating left
Cause: The twentytwenty uses a weak (sorry guys) margin: auto to align each content block centered in the page instead of using a wrapper.
For compatibility reasons, EnlighterJS resets the margin/padding of its container - therefore the margin is not applied.
Solution: Add some custom css
.enlighter-default{
margin: 0 auto 1.25em auto;
}