Material-icons with <Icon></Icon> does not work as expected

[ThraaxSession]

Hi :)

I want to use re-bulma with material-icons like this:

<Addons>
     <Icon icon='material-icons'>face</Icon>
     <Input className="username"
          onChange={this.validateUsernameOnChange}
          color={this.state.inputusername}/>
</Addons>

I expected it looks like <Button/> instead <Icon/>but there is only white space. Even if I user className it doesn't look like with a button.

Could help please?

Thanks and best regards
Gino