How to change Icon Size

How to change the size of these 3 Icons or how to replace it?

Solution: 

We offer you to use custom style. Font awesome is involved in Claue, you can change icons according to it's library. 

You can go: 

MGS -> Theme setting -> custom style

You need to choose the proper storeview, then clear cache and check it again in your private browser mode

For example: 

This is how custom style section looks like