ZSH_HIGHLIGHT_HIGHLIGHTERS=(main brackets)
. ~/work/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
typeset -A ZSH_HIGHLIGHT_STYLES
-ZSH_HIGHLIGHT_STYLES[assign]="fg=cyan"
+ZSH_HIGHLIGHT_STYLES[assign]="fg=yellow"
ZSH_HIGHLIGHT_STYLES[commandseparator]="fg=red"
ZSH_HIGHLIGHT_STYLES[single-hyphen-option]="fg=green,bold"
ZSH_HIGHLIGHT_STYLES[double-hyphen-option]="fg=green"