Twitter Bootstrap Input Append

Input append breaks when it is wrapped within a row-fluid class. Once row-fluid is changed to row, everything works again.

by zhenghao1

HTML

<link rel="stylesheet" href="https://github.com/twitter/bootstrap/blob/master/docs/assets/css/bootstrap.css">
<link rel="stylesheet" href="https://github.com/twitter/bootstrap/blob/master/docs/assets/css/bootstrap-responsive.css">
<div class="container-fluid">
    <div class="span8">
        <div class="row-fluid">
            <form class="form-horizontal">
                <div class="control-group">
                    <label class="control-label" for="appendedInput">VAT:</label>
                    <div class="controls">                      
                        <div class="input-append">
                            <input class="span2" id="appendedInput" size="16" type="text">
                            <span class="add-on">%</span>
                        </div>
                    </div>
                </div>
            </form>
        </div>
    </div>
</div>

CSS

/*!
 * Bootstrap v2.0.3
 *
 * Copyright 2012 Twitter, Inc
 * Licensed under the Apache License v2.0
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Designed and built with all the love in the world @twitter by @mdo and @fat.
 */

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
nav,
section {
  display: block;
}

audio,
canvas,
video {
  display: inline-block;
  *display: inline;
  *zoom: 1;
}

audio:not([controls]) {
  display: none;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
      -ms-text-size-adjust: 100%;
}

a:focus {
  outline: thin dotted #333;
  outline: 5px auto -webkit-focus-ring-color;
  outline-offset: -2px;
}

a:hover,
a:active {
  outline: 0;
}

sub,
sup {
  position: relative;
  font-size: 75%;
  line-height: 0;
  vertical-align: baseline;
}

sup {
  top: -0.5em;
}

sub {
  bottom: -0.25em;
}

img {
  max-width: 100%;
  vertical-align: middle;
  border: 0;
  -ms-interpolation-mode: bicubic;
}

button,
input,
select,
textarea {
  margin: 0;
  font-size: 100%;
  vertical-align: middle;
}

button,
input {
  *overflow: visible;
  line-height: normal;
}

button::-moz-focus-inner,
input::-moz-focus-inner {
  padding: 0;
  border: 0;
}

button,
input[type="button"],
input[type="reset"],
input[type="submit"] {
  cursor: pointer;
  -webkit-appearance: button;
}

input[type="search"] {
  -webkit-box-sizing: content-box;
     -moz-box-sizing: content-box;
          box-sizing: content-box;
  -webkit-appearance: textfield;
}

input[type="search"]::-webkit-search-decoration,
input[type="search"]::-webkit-search-cancel-button {
  -webkit-appearance: none;
}

textarea {
  overflow: auto;
  vertical-align: top;
}

.clearfix {
  *zoom: 1;
}

.clearfix:before,
.clearfix:after {
  display: table;
  content: "";
}

.clearfix:after {
  clear: both;
}

.hide-text {
  font: 0/0 a;
  color: transparent;
  text-shadow: none;
  background-color: transparent;
  border: 0;
}

.input-block-level {
  display: block;
  width: 100%;
 ...