SO Input field widths

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap-combined.min.css">
<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/js/bootstrap.min.js"></script>
<div class="container">
  <div class="row">
    <div class="span6">
      
            
    <form class="form-horizontal">
      <div class="control-group">
        <label class="control-label" for="inputEmail">Email</label>
        <div class="controls">
          <div class="input-prepend input-block-level">
            <span class="add-on"><i class="icon-envelope"></i></span>
            <input type="email" id="inputEmail" class="input-block-level" placeholder="Email">
          </div>
        </div>
      </div>
      <div class="control-group">
        <label class="control-label" for="inputPassword">Password</label>
        <div class="controls"><div class="input-prepend input-block-level">
            <span class="add-on passwordAddon"><i class=""> </i></span>
          <input type="password" id="inputPassword" class="input-block-level password password-With-Prepend" placeholder="Password">
        </div>
      </div>
    </form>
      
        
        <hr>
        <hr>
           
    <form class="form-horizontal">
      <div class="control-group">
        <label class="control-label" for="inputEmail">Email</label>
        <div class="controls">
          <div class="input-prepend input-block-level">
            <span class="add-on"><i class="icon-envelope"></i></span>
            <input type="email" id="inputEmail" class="input-block-level" placeholder="Email">
          </div>
        </div>
      </div>
      <div class="control-group">
        <label class="control-label" for="inputPassword">Password</label>
        <div class="controls"><div class="input-prepend input-block-level">
            <span class="add-on"><i class=""> </i></span>
          <input type="password" id="inputPassword" class="input-block-level passwordPrepend"...

CSS

.passwordAddon{
  background-color:inherit !important;
  border-right:none !important;
}

.password-With-Prepend{
  border-left:none !important;
}