效果展示:

css代码

body {
    margin: 0;
    padding: 0;
    background: #111111;
    color: #d9d9d9;
}

.top {
    background: #000;
    width: 100%;
    height: 35px;
    color: #17A1FF;
    font-size: 18px;
    line-height: 35px;
    text-align: center;
}

.loginbg {
    width: 30%;
    background: #000;
    margin: 20px 0 0px 0;
    border-radius: 30px 30px 30px 30px;
    /*background-image: url("http://img.netbian.com/file/2022/0223/010035r3aFr.jpg");*/
    /*opacity:0.1;*/
}

.blue {
    color: #17A1FF;
    font-size: 18px;
    line-height: 50px;

}

.user_ico {

    background-image: url("http://v.bootstrapmb.com/2021/8/apbk210845 /img/login_ico.png");
    background-repeat: no-repeat;
    background-position: -125px -34px;
    margin: 10px 13px;
    position: absolute;
}

.user {
    width: 50%;
    height: 30px;
    border-width: 1px;
    border-radius: 20px 20px 20px 20px;
    margin: 5px 0 20px 5px;
    color: #007DDB;

    /*border: rgba(255,255,255,0.2) 2px solid !important;*/
    /*background-color:transparent*/
    background-color: #d9d9d9;
}

.login {
    text-align: center;
    font-size: 20px;
    line-height: 50px;
    width: 50%;
    height: 50px;
    border-radius: 10px 10px 10px 10px;
    margin: 15px 0 20px 55px;
    background-color: #007DDB;
    color: #FFFFFF;
}

.pic {
    margin: 10px auto;
    margin: 150px 0 0px 0;
}

img {
    /*border-radius: 20px;*/

    border-radius: 50%
}

html代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>管理员系统</title>
    <link rel="shortcut icon" href="https://mat1.gtimg.com/qqcdn/qqindex2021/favicon.ico"/>
    <style type="text/css">
        @import "admin.css";


    </style>
</head>
<body>



<div class="top">遇见彩虹 吃定彩虹</div>

<div align="center">
    <div class="pic">
        <img src="https://img2.woyaogexing.com/2022/02/21/5831daf62f54429cbd22c9cd076acd37!400x400.jpeg" width="100" height="100" alt="头像">
    </div>
    <div class="loginbg">
        <p class="blue">管理员登录</p>
        账号:
        <input class="user" type="text"> <br>
        密码:
        <input class="user" type="password">
        <br>
<!--        <input type="button" class="login" value="登录后台">-->
        <div class="login">点击登录</div>
        <br>
    </div>

</div>


</body>
</html>

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