Cannot set searchBox options.cssClasses.input

I’m getting error when trying to set the options.cssClasses.input on searchBox widget.

Uncaught InvalidCharacterError: Failed to execute 'add' on 'DOMTokenList': 
The token provided ('ais-search-box--input form-control') contains HTML space characters, 
which are not valid in tokens.

[wojtekmieszczak]

searchBoxWidget = instantsearch.widgets.searchBox(
    container: '.app-search'
    wrapInput: true
    autofocus: true
    cssClasses:
        root: 'input-group'
        input: 'form-control'
)

Just noticed that problem also occurs with root class. Other widgets css classes works fine.

[wojtekmieszczak]

It works now, @vvo . Thanks.