Input field width and height: how to change them

I've never touched drupal's theming layer before, so I apologize for the basic question. I'm trying to change the default width and height for the input fields used in drupal forms.

Is there a generic template that I need to change? or do I have to find everywhe开发者_Go百科re where there's a form, find its template, and change it. Any tips on how to proceed with this?

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If you want to change all inputs' width you can use pure css. All inputs in drupal have a class called "form-text".

So you can write

.form-text{
    width:100px;
}

If you really want to wirte your own template - you should look towards the theme_form_element function.