How to chnage the border color of a tex entry box bellow choice in multiple choice question?

Hallo,
I'd like to change the borer of text-entry box from blue to some else. The box is attached to one of options using the Qulatrics "Allow Text Entry" function. This option is pre-selected in the beginning. Ideally I'd like to have orange when the box is focused and light-gray otherwise.
I've tried these two CSS codes:

li.Selection.TextEntryBox.InputText
{border-color: red!important;}

li.Selection.TextEntryBox.InputText:checked
{border-color: red!important;}

li.Selection.TextEntryBox.InputText:focus
{border-color: #f79013!important;}

The first two do nothing and the second one works only if another option is selected. You can see it in following images:

1) The box is NOT focused:
!
!

2) The box is focused:
!
!

Note: I use the Minimal blue template.

Thank you for any ideas!