Change width of shortcode dropdown

Hi!

What CSS would we use to narrow the width of the dropdown we inserted into our header via shortcode?
Website: https://www.yorklandtrust.org/

These classes appear in the generated code: .gt_container-pvf6d1 .gt_switcher
We also see .gtranslate_wrapper in the settings screen.
However, none appear to work with width: 150px; even with !important

Thanks in advance for your recommendations.

P.S. The settings screen instructions also referenced [gtranslate] for the shortcode, but we found that only [GTranslate] worked. Love the plugin.