You can do rotate easily with CSS transforms, something like this:
<style>
.km-home:after {
-webkit-transform: rotate(90deg);
transform: rotate(90deg);
}
</style>
You can flip an element with CSS transforms too:
<style>
.km-home:after {
-webkit-transform: scaleX(-1);
transform: scaleX(-1);
}
</style>
You can also use scale to resize it - scale(2), etc...
However this question has nothing to do with Kendo UI :)