Make a raw_id_fields input textbox wider

[Victor]

I'm trying  to make the input textbox of a raw_id_fields wider than the default 
size  but without success.
Here is what I tried ('codarticolo' is the raw_id_fields):

admin.py
.............
class MovimentomagInline(admin.TabularInline):
    formfield_overrides = {
        models.CharField: {'widget': TextInput(attrs={'size':'30'})},
        models.TextField: {'widget': Textarea(attrs={'rows':4, 'cols':40})},
    }
    widgets = {
            'codarticolo': SelectMultiple(attrs={'size': 30})
        }

 #   list_display = ('codarticolo', 'numconfezioni', 
'numerounita','totalepezzi')
    raw_id_fields = ['codarticolo',]
    fields = ('codarticolo', 'numconfezioni', 'numerounita','totalepezzi')
    model=Movimentomag
    extra=3

What should I do?
Ciao
Vittorio

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