CSS for overriding Roam Navigator visual hint styles (https://github.com/mgsloan/roam-navigator). Can be used in extensions like Roam Toolkit (Custom CSS feature) or Stylish

roam-navigator-theme.css

.roam_navigator_hint {
  color: purple !important;
  font-size: 20px !important; 
}

.roam_navigator_hint_typed {
  color: orange !important;
}

.roam-sidebar-container .roam_navigator_hint, #right-sidebar .roam_navigator_hint {
  color: white !important;
}