Please refer Faq's page in documentation itself for queries of customization like colors,rtl ,dark,transparent styles,etc..
Refer following links for usage:
| Icons | References |
|---|---|
| Font Awesome | https://fontawesome.com/v4.7.0/icons/ |
| Material Design Icons | https://materialdesignicons.com/ |
| Simple Line Icons | https://simplelineicons.github.io/ |
| Feather Icons | https://feathericons.com/ |
| Ionic Icons | https://ionicons.com/ |
| Pe7 Icons | https://themes-pixeden.com/font-demos/7-stroke/ |
| Themify Icons | https://themify.me/themify-icons |
| Typicons Icons | https://www.s-ings.com/typicons/ |
| Weather Icons | https://erikflowers.github.io/weather-icons/ |
| Material Icons | https://fonts.google.com/icons?selected=Material+Icons |
| Bootstrap Icons | https://icons.getbootstrap.com |