我正在尝试制作响应式弹出式注册和登录表单。当网站在超小型设备中打开时，某些表单文本不显示。我想滚动叠加而不是滚动。请帮助。下面给出了代码
HTML
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">
<link rel="icon" href="favicon.ico">
<title>Cover of Quiz Up</title>
<!-- Bootstrap core CSS -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>
<script type="text/javascript" src="js/jquery.leanModal.min.js"></script>
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.min.css" />
<link type="text/css" rel="stylesheet" href="css/style.css" />
<!-- Custom styles for this template -->
<link href="css/cover.css" rel="stylesheet">
</head>
<body>
<div class="site-wrapper" >
<div class="site-wrapper-inner" >
<div class="cover-container" >
<div class="masthead clearfix">
<div class="inner">
<h1 class="masthead-brand">Quiz Up</h1>
<nav>
<ul class="nav masthead-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Take Quiz</a></li>
<li><a href="#">Contact</a></li>
</ul>
</nav>
</div>
</div>
<div class="inner cover">
<h1 class="cover-heading">What's New</h1>
<p class="lead">A system created to help students enhance their skills regarding their courses or subjects of interest.Covering a wide range of concepts and giving more exposure to students</p>
<p class="lead">
<div class="row">
<div class="col-xs-6">
<a href="#" class="btn btn-lg btn-default">Sign Up</a></div>
<div class="col-xs-6"> <a id="modal_trigger" href="#modal" class="btn btn-lg btn-default">Sign In</a></div>
</p>
</div>
</div>
<div id="modal" class="popupContainer" style="display:none;">
<header class="popupHeader">
<span class="header_title">Login</span>
<span class="modal_close"><i class="fa fa-times"></i></span>
</header>
<section class="popupBody">
<!-- Social Login -->
<div class="social_login">
<div class="">
<a href="#" class="social_box fb">
<span class="icon"><i class="fa fa-facebook"></i></span>
<span class="icon_title">Connect with Facebook</span>
</a>
<a href="#" class="social_box google">
<span class="icon"><i class="fa fa-google-plus"></i></span>
<span class="icon_title">Connect with Google</span>
</a>
</div>
<div class="centeredText">
<span>Or use your Email address</span>
</div>
<div class="action_btns">
<div class="one_half"><a href="#" id="login_form" class="btn">Login</a></div>
<div class="one_half last"><a href="#" id="register_form" class="btn">Sign up</a></div>
</div>
</div>
<!-- Username & Password Login form -->
<div class="user_login">
<form >
<label>Email / Username</label>
<input type="text" />
<br />
<label>Password</label>
<input type="password" />
<br />
<div class="checkbox">
<input id="remember" type="checkbox" />
<label for="remember">Remember me on this computer</label>
</div>
<div class="action_btns">
<div class="one_half"><a href="#" class="btn back_btn"><i class="fa fa-angle-double-left"></i> Back</a></div>
<div class="one_half last"><a href="#" class="btn btn_red">Login</a></div>
</div>
</form>
<a href="#" class="forgot_password">Forgot password?</a>
</div>
<!-- Register Form -->
<div class="user_register">
<form>
<label>Full Name</label>
<input type="text" />
<br />
<label>Email Address</label>
<input type="email" />
<br />
<label>Password</label>
<input type="password" />
<br />
<div class="checkbox">
<input id="send_updates" type="checkbox" />
<label for="send_updates">Send me occasional email updates</label>
</div>
<div class="action_btns">
<div class="one_half"><a href="#" class="btn back_btn"><i class="fa fa-angle-double-left"></i> Back</a></div>
<div class="one_half last"><a href="#" class="btn btn_red">Register</a></div>
</div>
</form>
</div>
</section>
</div>
</div>
<div class="mastfoot">
<div class="inner">
<p >Copyright © 2014 All Rights Reserved Design by Waqas Iqbal</p>
</div>
</div>
</div>
</div>
</div>
<script src="js/bootstrap.min.js"></script>
<script type="text/javascript">
$("#modal_trigger").leanModal({top : 100, overlay : 0.6, closeButton: ".modal_close"
});
$(function(){
// Calling Login Form
$("#login_form").click(function(){
$(".social_login").hide();
$(".user_login").show();
return false;
});
// Calling Register Form
$("#register_form").click(function(){
$(".social_login").hide();
$(".user_register").show();
$(".header_title").text('Register');
return false;
});
// Going back to Social Forms
$(".back_btn").click(function(){
$(".user_login").hide();
$(".user_register").hide();
$(".social_login").show();
$(".header_title").text('Login');
return false;
});
})
</script>
</body>
</html>
CSS
@import url(http://fonts.googleapis.com/css?family=Source+Sans+Pro:400,700,700italic,400italic);
body {font-family: 'Source Sans Pro', sans-serif; font-size: 14px; color: #666;}
#lean_overlay {
position:fixed;
z-index:100;
top: 0px;
left: 0px;
height:100%;
width:100%;
background: #000;
display: none;
overflow-y:scroll;
}
.popupContainer{
position:fixed;
width:330px;
height: auto;
left:45%;
top:80px;
background: #FFF;
}
#modal_trigger {margin:auto; width:100px; display:block;}
.btn {padding:10px 20px; background: #F4F4F2;}
.btn_red {background: #ED6347; color: #FFF;}
.btn:hover {background: #E4E4E2;}
.btn_red:hover {background: #C12B05;}
a.btn {color:#666; text-align: center; text-decoration: none;}
a.btn_red {color: #FFF;}
.one_half {width:50%; display: block; float:left;}
.one_half.last {width:45%; margin-left:5%;}
/* Popup Styles*/
.popupHeader {font-size:16px; text-transform: uppercase;}
.popupHeader {background:#F4F4F2; position:relative; padding:10px 20px; border-bottom:1px solid #DDD; font-weight:bold;}
.popupHeader .modal_close {position: absolute; right: 0; top:0; padding:10px 15px; background:#E4E4E2; cursor: pointer; color:#aaa; font-size:16px;}
.popupBody {padding:20px;pos}
/* Social Login Form */
.social_login {}
.social_login .social_box {display:block; clear:both; padding:10px; margin-bottom: 10px; background: #F4F4F2; overflow: hidden;}
.social_login .icon {display:block; width:40px; padding:5px 10px; margin-right: 10px; float:left; color:#FFF; font-size:16px; text-align: center;}
.social_login .fb .icon {background:#3B5998;}
.social_login .google .icon {background:#DD4B39;}
.social_login .icon_title {display:block; padding:5px 0; float:left; font-weight: bold; font-size: 16px; color:#777;}
.social_login .social_box:hover {background: #E4E4E2;}
.centeredText {text-align: center; margin: 20px 0; clear: both; overflow: hidden; text-transform: uppercase;}
.action_btns {clear:both; overflow: hidden;}
.action_btns a {display: block;}
/* User Login Form */
.user_login {display: none;}
.user_login label {display: block; margin-bottom:5px;}
.user_login input[type="text"], .user_login input[type="email"], .user_login input[type="password"] {display: block; width:90%; padding: 10px; border:1px solid #DDD; color:#666;}
.user_login input[type="checkbox"] {float:left; width:20%;}
.user_login input[type="checkbox"]+label {float:left;}
.user_login .checkbox {margin-bottom: 10px; clear: both; margin-right:5px;}
.forgot_password {display:block; margin: 20px 0 10px; clear: both; overflow: hidden; text-decoration: none; color:#ED6347;}
/* User Register Form */
.user_register {display: none;}
.user_register label {display: block; margin-bottom:5px;}
.user_register input[type="text"], .user_register input[type="email"], .user_register input[type="password"] {display: block; width:90%; padding: 10px; border:1px solid #DDD; color:#666;}
.user_register input[type="checkbox"] {float:left; margin-right:5px;}
.user_register input[type="checkbox"]+label {float:left;}
.user_register .checkbox {margin-bottom: 10px; clear: both; overflow: hidden;}
jquery的
(function ($) {
$.fn.extend({
leanModal: function (options) {
var defaults = {
top: 100,
overlay: 0.5,
closeButton: null
};
var overlay = $("<div id='lean_overlay'></div>");
$("body").append(overlay);
$("body").css({"overflow":"hidden"});
$("#lean_overlay").css({"overflow-y":"scroll"});
options = $.extend(defaults, options);
return this.each(function () {
var o = options;
var modal_id = $(this).attr("href");
function showModal() {
$("#lean_overlay").click(function () {
});
$(o.closeButton).click(function () {
close_modal(modal_id)
});
var modal_height = $(modal_id).outerHeight();
var modal_width = $(modal_id).outerWidth();
$("#lean_overlay").fadeTo(200, o.overlay);
$(modal_id).css({
"position": "fixed",
"opacity": 0,
"z-index": 1000,
"left": 50 + "%",
"margin-left": -(modal_width / 2) + "px",
"top": o.top + "px"
});
$(modal_id).fadeTo(200, 1);
};
$(document).ready(function () {
showModal();
});
$(this).click(function (e) {
showModal();
e.preventDefault()
})
});
function close_modal(modal_id) {
$("#lean_overlay").fadeOut(200);
$(modal_id).css({
"display": "none"
})
}
}
})
})(jQuery);