Hello
By default this option is not available. You could try copying the source from your example site which looks some like the following...
HTML (add to custom module)
<div class="service-icon">
<i class="fa fa-flash fa-3x"></i>
<i class="fa fa-flash fa-3x"></i>
</div>
CSS (add to template Custom CSS field)
.service-icon {
display: inline-block;
height: 85px;
width: 85px;
line-height: 101px;
-webkit-transform: rotate(47deg);
-moz-transform: rotate(47deg);
-ms-transform: rotate(47deg);
-o-transform: rotate(47deg);
transform: rotate(47deg);
}
.service-icon i {
-webkit-transform: rotate(-48deg);
-moz-transform: rotate(-48deg);
-ms-transform: rotate(-48deg);
-o-transform: rotate(-48deg);
transform: rotate(-48deg);
}
Ciaran