[Plugin: Contact Form 7] can't change input fields size ? (cosmetic)

I have setup a form on my site, with the below code – but it keeps making the size of the input fields stretch all across my full page width and not to the size I define in the coe below. I can only make 30 letters in the fields, but the form still strectches to the page border, so it’s purely a cosmetic thing, but I can’t change it.

Any ideas? ??

<p>Your Name (required)<br />
    [text* your-name 30/30] </p>

<p>Your Email (required)<br />
    [email* your-email 30/30] </p>

<p>Subject<br />
    [text your-subject 30/30] </p>

<p>Your Message<br />
    [textarea your-message 20x5] </p>

<p>[submit "Send"]</p>

https://www.ads-software.com/extend/plugins/contact-form-7/