CUSTOM PREVIEW - you can change this in the previewTemplate option

.icon-chevron-down:

.icon-chevron-left:

.icon-chevron-right:

.icon-chevron-up:

.icon-envelope:

.icon-external-link:

.icon-facebook:

.icon-instagram:

.icon-menu:

.icon-search:

.icon-twitter:

Embedded SVG option

(The data-grunticon-embed attribute tells grunticon to inject SVG inline):

icon-burger:

icon-burger (styled variation):