CSS Positioning with Firefox

Question

i've checked through the posts on several sites including stackoverflow
but was not able to see a similar problem like mine.

I have a page with some div containers, that separate input boxes and
let them look good.

Problem:
Although everything looks good on safari/opera/chrome, the boxes get weird
on firefox.

I'm posting the proper html and css parts and the url of the finished page and
a picture how the right and the wrong version look like.

I would be happy, if someone would clear me up on the general error so i can
avoid it in the future.

Thank you for reading :)

<div id="inner_content_big">
    <div style="width: 900px; margin: 0 auto; ">
        <div class="box_login_banner">
            <h1>Login, Welcome :]</h1>
        </div>
        <div style=" clear: both; "></div>
        <div class="box_login_container">
            <?
            $data_form['class'] = 'form_login';
            ?>
            <?= form_open( 'user/login', $data_form ); ?>
            <div class="box_login_inputs">
                <div id="input_container">
                    <div id="input_label">
                        <h4>Email</h4>
                    </div>
                    <input type="input" name="login_username" id="login_special_input" class="validate[required,length[0,100]]" />
                    <div id="input_hint">
                        <h5>This is the address you specified while registering.</h5>
                    </div>
                </div>
            </div>
            <div style="clear: both;"></div>
            <div class="box_login_inputs">
                <div id="input_container">
                    <div id="input_label">
                        <h4>Password</h4>
                    </div>
                    <input type="password" name="login_password" id="login_special_input" class="validate[required,length[0,100]]" />
                    <div id="input_hint">
                        <h5>Please remember that the password is <u>case sensitive</u>.</h5>
                    </div>
                </div>
            </div>
            <?= form_close(); ?>
        </div>
        <div class="box_login_right">
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</div>
        <div style="float: left; ">
            <a class="css_button steelblue" href="#" id="button_submit">
                <span>Login</span>
            </a>
            <a class="css_button pink" href="#download" id="button_forgot_password">
                <span>Forgot your Password?</span>
            </a>
        </div>
        <div style="float: right; margin-right: 6px; ">
            <a class="css_button orange" href="#" id="button_no_account">
                <span>No account?</span>
            </a>
        </div>
        <?php if ( @$error_message != '' ): ?>
        <div class="redcssboxes box_login_infobox">
            <p>
                <img src="<?= base_url(); ?>images/header/error.png" />
                <?= $error_message; ?>
            </p>
        </div>
        <?php endif ?>
    </div>

.box_login_banner {
    float: left;
    margin-left: -26px;
    width: 939px;
    height: 50px;
    border-bottom: 1px solid #DDD;
}

.box_login_banner h1 {
    font-size: 28px;
    color: #888;
    margin-left: 30px;
    margin-top: -12px;
}


.box_login_container {
    float: left;
    margin-top: 40px;
    height: 200px;
    width: 440px;
}

.box_login_right {
    float: right;
    margin-top: 40px;
    margin-right: 14px;
    height: 200px;
    width: 420px;
}

.box_login_inputs {
    width: 888px;
    height: 100px;
    margin-top: -26px;
    margin-right: 0px;
}

.box_login_container #input_label {
    margin-left: 4px;
    width: 300px;
    height: 30px;
}

.box_login_container #input_label h4 {
    color: #888;
    font-weight: bold;
}

.box_login_container #input_container {
    float: left;
    margin-top: 10px;
    margin-left: 20px;
    width: 400px;
    height: 120px;
}

.box_login_container #input_container input {
    margin-top: -5px;
}

.box_login_container #input_hint {
    margin-top: -10px;
    margin-left: 4px;
    width: 100%;
    height: 20px;
}

.box_login_container #input_hint h5 {
    font-size: 12px;
    color: #999;
}


#login_special_input {
    color: #777;
    font-size:26px;
    width:97%;
    margin-top:2px;
    margin-right:6px;
    margin-bottom:16px;
    border:1px solid #e5e5e5;
    background:#fbfbfb;
    padding:3px;
}

Answer 1

removing {float:left} prop of .box_login_container #input_container will give you desire result

Updated and corrected fiddle: http://jsfiddle.net/Zg7tH/1/

remember the suggestions for class and ids

reasons:

.box_login_inputs{ margin-top: -26px;} --> causing it to slide up and
.box_login_container #input_container {float:left} --> causing it to flow along with previous elements

Answer 2

login_special_input, input_container, etc. are IDs.

You can't use the same ID on two different elements. Change them to classes.