Code blocks use a variable-width font

[Ken g6]

It seems to be an issue in the CSS. Fixed-width is normal for code blocks, and there's a style to use fixed-width:

code, kbd, pre, samp {
  font-family: monospace,monospace;
  font-size: 1em;
}

But it's overridden:

.bbCodeCode code {
  font-family: inherit;
}