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我試圖找出twitter引導的表單結構。我想換到一個特定的驗證狀態http://getbootstrap.com/css/#forms-control-states(向下滾動一點點),我有這樣的形式:更改輸入元素的顏色
<form class="form-signin" id="registerForm">
<input class="form-control input-sm" type="email" placeholder="E-mail">
<input class="form-control input-sm" type="text" maxlength="30" placeholder="Username (6-30 characters)">
<input class="form-control input-sm" type="password" maxlength="30" placeholder="Password (6-30 characters)">
<button id="registerButton" class="btn-small"><b>Register</b></button>
</form>
我應該改變什麼屬性能夠得到一個inputfield一個特定的驗證顏色?