文本框无法正常工作

Question

我目前正在构建一个包含多个字段和Facebook登录的登录页面。在这个页面上，我有2个输入，用户名和密码，以及其他三个div。这些div是图形元素和facebook登录按钮。

我在密码字段方面遇到了困难。出于某种原因，大多数文本框都不可点击。我相信这是因为图形div与此文本框重叠。但是，当我更改z索引时，没有任何反应。为什么会这样？

HTML：

<div id="login-banner" class="login-popup">
            <a href="#" class="close"><p class="herro">x</p></a>
            <form method="post" class="signin" action="#">
                <fieldset class="textbox">
                    <label class="signup_email">
                        <span>Email</span>
                        <input id="signup_email" name="email" value="" type="text" autocomplete="on" placeholder="E-Mail">
                    </label>
                    <label class="signup_password_two">
                        <span>Password</span>
                        <input id="signup_password_two" name="password" value="" type="text" autocomplete="on" placeholder="Password">
                    </label>
                    <button class="submit button" type="button">Sign Up</button>
                    <p><a class="forgot" href="#">Forgot your password?</a></p>        
                </fieldset>
               </form>
               <div id="vertical_one"></div>
               <div id="OR"><p>or</p></div>
               <div id="vertical_two"></div>
               <div id="facebook_login"><img src="{% static 'home/facebook_login.gif' %}" /></div>
        </div>

CSS：

* Login Banner CSS: Begin */
/*----------------------------------------------------------------*/
/*----------------------------------------------------------------*/
/*----------------------------------------------------------------*/
.content_splash #mask {
    display: none;
    background: #FFFFFF;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 11;
    width: 100%;
    height: 100%;
    opacity: 0.8;
}

.content_splash #login-banner.login-popup {
    display: none;
    background: #FFFFFF;
    padding: 10px;
    width: 480px;
    border: 2px solid #ddd;
    float: left;
    font-size: 1.2em;
    position: fixed;
    top: 50%;
    left: 50%;
    z-index: 99999;
    box-shadow: 0px 0px 20px #999;
    /* CSS3 */
        -moz-box-shadow: 0px 0px 20px #999;
    /* Firefox */
        -webkit-box-shadow: 0px 0px 20px #999;
    /* Safari, Chrome */
    border-radius: 3px 3px 3px 3px;
    -moz-border-radius: 3px;
    /* Firefox */
        -webkit-border-radius: 3px;
    /* Safari, Chrome */;
}

.content_splash #login-banner .herro {
    margin-left: 465px;
    margin-top: -6px;

}

.content_splash fieldset {
    border: none;
}

.content_splash form.signin .textbox label {
    display: block;
    padding-bottom: 7px;
}

.content_splash form.signin .textbox span {
    display: block;
}

.content_splash form.signin p, form.signin span {
    color: #999;
    font-size: 11px;
    line-height: 18px;
}

.content_splash form.signin .textbox input {
    background: #666666;
    border-bottom: 1px solid #333;
    border-left: 1px solid #000;
    border-right: 1px solid #333;
    border-top: 1px solid #000;
    color: #fff;
    border-radius: 3px 3px 3px 3px;
    -moz-border-radius: 3px;
    -webkit-border-radius: 3px;
    font: 13px Arial, Helvetica, sans-serif;
    padding: 6px 6px 4px;
    width: 200px;
}

.content_splash form.signin input:-moz-placeholder {
    color: #bbb;
    text-shadow: 0 0 2px #000;
}

.content_splash form.signin input::-webkit-input-placeholder {
    color: #bbb;
    text-shadow: 0 0 2px #000;
}

.content_splash .button {
    background: -moz-linear-gradient(center top, #f3f3f3, #dddddd);
    background: -webkit-gradient(linear, left top, left bottom, from(#f3f3f3), to(#dddddd));
    background: -o-linear-gradient(top, #f3f3f3, #dddddd);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#f3f3f3', EndColorStr='#dddddd');
    border-color: #000;
    border-width: 1px;
    border-radius: 4px 4px 4px 4px;
    -moz-border-radius: 4px;
    -webkit-border-radius: 4px;
    color: #333;
    cursor: pointer;
    display: inline-block;
    padding: 6px 6px 4px;
    margin-top: 10px;
    font: 12px;
    width: 214px;
}

.content_splash .button:hover {
    background: #ddd;
}

.content_splash #login-banner.login-popup #vertical_one{
    position: absolute;
    background: -webkit-gradient(linear, 1 0, 100% 0, from(#e2e3e4), to(#e2e3e4), color-stop(50%, black));  
    width: 1px; 
    height: 75px;
    margin-top: -203px;
    margin-left: 250px;

}
.content_splash #login-banner.login-popup #vertical_two{
    position: absolute;
    background: -webkit-gradient(linear, 1 0, 100% 0, from(#e2e3e4), to(#e2e3e4), color-stop(50%, black));  
    width: 1px; 
    height: 75px;
    margin-top: -110px;
    margin-left: 250px;
}
.content_splash #login-banner.login-popup #OR{
    font-size: 13px;
    position: absolute;
    margin-top: -141px;
    padding-left:243px;
    color: black;
}
.content_splash #login-banner.login-popup #facebook_login{
    position: absolute;
    padding-left: 270px;
    margin-top: -138px;