我正在尝试创建一个由两个具有内嵌填充的输入字段组成的登录表单，但这两个字段最终总是超出其父字段的边界；问题源于添加的内嵌填充。为了纠正这个问题，可以做些什么？

JSFiddle代码片段： http://jsfiddle.net/4x2KP/

注意:代码可能不是最干净的。例如，封装文本输入的span元素可能根本不需要。

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    #mainContainer {
    	line-height: 20px;
    	font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
        background-color: rgba(0,50,94,0.2);
    	margin: 20px auto;
    	display: table;
    	-moz-border-radius: 15px;
    	border-style: solid;
    	border-color: rgb(40, 40, 40);
    	border-radius: 2px 5px 2px 5px / 5px 2px 5px 2px;
    	border-radius: 2px;
    	border-radius: 2px 5px / 5px;
    	box-shadow: 0 5px 10px 5px rgba(0,0,0,0.2);
    .loginForm {
    	width: 320px;
    	height: 250px;
    	padding: 10px 15px 25px 15px;
    	overflow: hidden;
    .login-fields > .login-bottom input#login-button_normal {
    	float: right;
    	padding: 2px 25px;
    	cursor: pointer;
    	margin-left: 10px;
    .login-fields > .login-bottom input#login-remember {
    	float: left;
    	margin-right: 3px;
    .spacer {
    	padding-bottom: 10px;
    /* ELEMENT OF INTEREST HERE! */
    input[type=text],
    input[type=password] {
        width: 100%;
    	height: 20px;
    	padding: 5px 10px;
    	background-color: rgb(215, 215, 215);
        line-height: 20px;
        font-size: 12px;
        color: rgb(136, 136, 136);
        border-radius: 2px 2px 2px 2px;
        border: 1px solid rgb(114, 114, 114);
    	box-shadow: 0 1px 0 rgba(24, 24, 24,0.1);
    input[type=text]:hover,
    input[type=password]:hover,
    label:hover ~ input[type=text],
    label:hover ~ input[type=password] {
     	background:rgb(242, 242, 242) !important;
    input[type=submit]:hover {
      box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.3),
        inset 0 -10px 10px rgba(255,255,255,0.1);
    }

    <div id="mainContainer">
        <div id="login" class="loginForm">
            <div class="login-top">
            <form class="login-fields" onsubmit="alert('test'); return false;">
                <div id="login-email" class="login-field">
                    <label for="email" style="-moz-user-select: none;-webkit-user-select: none;" onselectstart="return false;">E-mail address</label>
                    <span><input name="email" id="email" type="text"></input></span>
                <div class="spacer"></div>
                <div id="login-password" class="login-field">
                    <label for="password" style="-moz-user-select: none;-webkit-user-select: none;" onselectstart="return false;">Password</label>
                    <span><input name="password" id="password" type="password"></input></span>
                <div class="login-bottom">
                    <input type="checkbox" name="remember" id="login-remember"></input>
                    <label for="login-remember" style="-moz-user-select: none;-webkit-user-select: none;" onselectstart="return false;">Remember my email</label>
                    <input type="submit" name="login-button" id="login-button_normal" style="cursor: pointer" value="Log in"></input>
            </form>
    </div>

​