How do I set the dimensions & position of a fieldset as well as those of the elements within?

Hi everyone.

I have a field set as shown in the below code. I already understand how to set the max length of input elements and the max size of the contents.

My question is two-fold. If this is contrary to the rules please advise me and I will divide my questions up.

1)
I would like to understand how to set the length, width and position of the fieldset on the page.  As well as the elements within

Also what are the dimensions of a browser page in terms of pixels? I would like design my page so that the appear the same irrespective of the resolution that they have set their monitor to.

<fieldset>
 
  <label for="Email"><span class="hlY">Email/User</span></label>
 
  <input type="text" name="Email" maxlength="40" size="20" />
  <br />
  <label for="Pass"><span class="tcO">Password</span></label>
  <input type="password" name="Pass" maxlength="20" size="20" />
  <br />
  <INPUT TYPE=SUBMIT VALUE="Enter" maxlength="20"/>
</fieldset>

Many thanks again in advance.

wb