Change row amount in textarea

Hi,
I want to limit the rows of the textarea-field in the contactform.
I saw it is now 7 rows:
<textarea name=”avia_5_1″ class=”text_area is_empty” cols=”40″ rows=”7″ id=”avia_5_1″></textarea>
and I want to reduce to 3
<textarea name=”avia_5_1″ class=”text_area is_empty” cols=”40″ rows=”3″ id=”avia_5_1″></textarea>
Can you tell me where I can chang this?

I use a child-theme. Thanks in advance

• This topic was modified 5 years ago by karinorage. Reason: typo correction