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如何使 div 内的容器居中对齐....我给了margin left and right auto，但它不起作用....在iphone布局中它变成居中对齐，提供下面的代码....

http://jsfiddle.net/2a5mW/1/embedded/result/ 

<div class="hide fade in" id="signup-modal" conduit_fixed_handled="true" conduit_orig_mtop_val="-306" style=" display: block;" aria-hidden="false">
    <div class="page-title">Add New Vendor</div>
    <div>
                    <span>Vendor no</span>


100012                  <span style="">Starting no:</span><span style="color: red;">100000</span>
                </div>

    <h4 class="billingAddress">Billing Address</h4>

    <form method="POST" autocomplete="off" id="auth-form">
        <input type="hidden" name="usertype" value="3" readonly="">
        <fieldset>      
            <input type="text" placeholder="Company Name " name="fullname" maxlength="30" required="required" id="id_username">
            <input type="text" placeholder="Contact Name" name="company" maxlength="30" required="required" id="id_company">        
            <input type="text" placeholder="Address1" name="email" maxlength="75" required="required" id="id_email">
            <input type="password" placeholder="Address2" name="password" maxlength="16" required="required" id="id_password">
            <input type="password" placeholder="Address3" name="repassword" required="required" id="id_repassword">
            <input type="text" placeholder="City " name="fullname" maxlength="30" required="required" id="id_username">
            <div class="controls"
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1 回答 1

1 
#signup-modal, #login-modal {
width: 300px;
background: none repeat scroll 0% 0% rgb(255, 255, 255);
border-radius: 10px 10px 10px 10px;
overflow: hidden;
margin-bottom: 40px;
box-shadow: 0px 1px 0px white inset;
padding: 0px 40px;
margin-left: auto;
margin-right: auto;
}

这适用于 Firefox 和 Chrome。

于 2013-03-26T17:41:55.740 回答