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I need to customize the aspect of one single field in a editing admin form. More specifically I want change the height of a multiselect field. Have I to create complete admin sub-theme containing just a one-line CSS file or there is another way to achieve this?

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You could use hook_form_alter in a module to attach a the CSS (library) to the form with the needed changes.

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  • Thanks. Can I use this function for ADMIN forms? If yes, how can I prevent to lose it with further core updates?
    – Gabriele
    Commented Feb 3, 2016 at 15:46
  • @Gabriele You should look at hook_form_alter in the documentations (api.drupal.org). I'm expecting you know how to make a module understand hooks etc in my answer, as those are needed.
    – googletorp
    Commented Feb 3, 2016 at 19:35
  • Ok, I was needing to be sure that my question was not misunderstood. I'm quite new to Drupal, I will read the docs about hook_form_alter carefully. Thanks a lot!
    – Gabriele
    Commented Feb 3, 2016 at 22:19

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