How to fix the size of the <html:select> combo box (contents may be larger but the combo size should be fixed)

How to fix the size of the combo box (contents may be larger but the combo size should be fixed).Now my开发者_C百科 combo size is changed based on the items in the combo.

I'm trying to get something similar to the yahoo sign up page security Question combo: https://edit.yahoo.com/registration?.src=fpctx&.intl=in&.done=http://in.yahoo.com/

my code: Text which decides the size of the combo

<select style="width: 100px">
  <option>Veeeeeeeeeeeeeeeery lllllllllllllloooong option</option>
</select>

or even better

<style>
.fixed-size  {
  width: 100px;
}
</style>

<select class="fixed-size">
  <option>Veeeeeeeeeeeeeeeery lllllllllllllloooong option</option>
</select>

Set the css style to "width:100px" or whatever width you want the combo box to be.