用bootstrap做一个背景可轮转的登录界面

用bootstrap做登入注册页面

效果图(由于2M的限制效果图大小不一致)



html代码
水平居中利用bootstrap的网格系统,offset-3向右移动3格.(网格系统中默认12个格)


<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>logintitle>

    <script src="https://cdn.bootcss.com/jquery/2.2.4/jquery.min.js">script>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <link href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
    <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js">script>
    <link rel="stylesheet" href="css/style.css">



head>
<body>
    <div class="container">
        <div class="form row">
            <div class="form-horizontal col-md-offset-3" id="login_form">
                <h3 class="form-title">LOGINh3>
                <div class="col-md-9">
                    <div class="form-group">
                        <i class="fa fa-user fa-lg">i>
                        <input class="form-control required" type="text" placeholder="Username" id="username" name="username" autofocus="autofocus" maxlength="20"/>
                    div>
                    <div class="form-group">
                            <i class="fa fa-lock fa-lg">i>
                            <input class="form-control required" type="password" placeholder="Password" id="password" name="password" maxlength="8"/>
                    div>
                    <div class="form-group">
                        <label class="checkbox">
                            <input type="checkbox" name="remember" value="1"/>记住我
                        label>
                    div>
                    <div class="form-group col-md-offset-9">
                        <button type="submit" class="btn btn-success pull-right" name="submit">登录button>
                    div>
                div>
            div>
        div>
    div>
body>
html>

css部分
用css3的动画的 @keyframes 规则,制作轮转图。

body{
    background: url("../img/1.jpg");
    animation-name:myfirst;
    animation-duration:12s;
    /*变换时间*/
    animation-delay:2s;
    /*动画开始时间*/
    animation-iteration-count:infinite;
    /*下一周期循环播放*/
    animation-play-state:running;
    /*动画开始运行*/
}
@keyframes myfirst
{
    0%   {background:url("../img/1.jpg");}
    34%  {background:url("../img/2.jpg");}
    67%  {background:url("../img/3.jpg");}
    100% {background:url("../img/1.jpg");}
}
.form{background: rgba(255,255,255,0.2);width:400px;margin:120px auto;}
/*阴影*/
.fa{display: inline-block;top: 27px;left: 6px;position: relative;color: #ccc;}
input[type="text"],input[type="password"]{padding-left:26px;}
.checkbox{padding-left:21px;}

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