bootstrap自适应电脑手机端后台登录界面代码

html:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>bootstrap自适应电脑手机端后台登录界面代码</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" type="text/css" media="screen" href="css/bootstrap.min.css" />
    <link rel="stylesheet" href="css/demo.css">
</head>
<body>
    <div class="signin">
        <div class="signin-head"><img src="images/test//head_120.png" alt="" class="img-circle"></div>
        <form action="" class="form-signin" role="form">
            <input type="text" class="form-control" placeholder="用户名" required autofocus />
            <input type="password" class="form-control" placeholder="密码" required>
            <button class="btn btn-lg btn-warning btn-block" type="submit">登录</button>
            <label for="" class="checkbox">
                <input type="checkbox" value="remember-me">记住我
            </label>
        </form>
    </div>
</body>
</html>

css:

body{
    background: url(../images/login_bg_0.jpg) #f8f6e9;
    background-size: cover;
}

.signin{
    width: 477px;
    height: 479px;
    background: url(../images/login_bg.png);

    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -239px;
    margin-left: -238px;
}
.signin-head{
    margin: 0 auto;
    width: 120px;
    padding-top:30px;
}
.form-signin{
    max-width: 330px;
    padding: 43px 15px 15px 15px;
    margin: 0 auto;
}
.form-signin .checkbox{
    margin-bottom: 10px;
}
.form-signin .checkbox{
    font-weight: normal;
}
.form-signin .form-control{
    position: relative;
    font-size: 16px;
    height: auto;
    padding: 10px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
.form-signin .form-control:focus{
    z-index: 2;
}
.form-signin input[type="text"]{
    margin-bottom: 14px;
    border-radius: 0;
    background: url(../images/login_user.png) 0 0 #bdbdbd no-repeat;
    padding-left: 60px;
    color: #fff;
}
.form-signin input[type="password"]{
    margin-bottom: 10px;
    border-radius: 0;
    background: url(../images/login_pas.png) 0 0 #bdbdbd no-repeat;
    padding-left: 60px;
    color: #fff;
}
.form-signin button{
    border-radius: 0;
}

在这里插入图片描述

bootstrap自适应电脑手机端后台登录界面代码

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