Adjusting the width of a text input type

Adjusting the width of a text input type

I'm using a text input, and whenever I search for anything on how to adjust the width of a text input, I get results for JQuery UI Mobile.

Here is a sample:

  1. <label for="seed">Seed:</label><input type="text" name="seed-input" id="seed" placeholder="Leave blank for random seed" />
I'm new to JS, JQuery, and CSS.