Need help customizing Contact 7 form

I would like to reduce the width of the message field, it’s too wide. And when I put the cursor in the message field, I get a blue background. How do I change it to a white background?

Also, the word ‘send’ doesn’t fit into the button icon. How do I make the button bigger?

<p><strong>Name *</strong><br />
    [text* your-name] </p>

<p><strong>Email *</strong><br />
    [email* your-email] </p>

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

<p><strong>Message *</strong><br />
    [textarea your-message] </p>

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