zsh-syntax-highlighting / highlighters / root
This is the root highlighter, that highlights the whole line if the current user is root.
How to activate it
To activate it, add it to ZSH_HIGHLIGHT_HIGHLIGHTERS:
ZSH_HIGHLIGHT_HIGHLIGHTERS=( [...] root)
How to tweak it
This highlighter defines the following styles:
root- the style for the whole line if the current user is root.
To override one of those styles, change its entry in ZSH_HIGHLIGHT_STYLES, for example in ~/.zshrc:
ZSH_HIGHLIGHT_STYLES[root]='bg=red'
The syntax for declaring styles is documented here.