This is the cursor highlighter, that highlights the cursor.
This highlighter defines the following styles:
cursor- the style for the current cursor position
To override one of those styles, change its entry in ZSH_HIGHLIGHT_STYLES,
for example in ~/.zshrc:
ZSH_HIGHLIGHT_STYLES[cursor]='bg=blue'The syntax for values is the same as the syntax of "types of highlighting" of
the zsh builtin $zle_highlight array, which is documented in the zshzle(1)
manual page.